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The following is a list of all the Categories, Products and Feature Articles on our site. We hope it will assist you in finding what you're looking for.


Categories

2" IVB Star Diagonal
For any and all SCTs that are 8" or larger! Quartz 99% Reflective Dielectric coated Mirror. This revolutionary 2" diagonal can eliminate the possibility of accidental rotation on wedge mounted SCTS. Our new and very special Denk Interlocking Visual Back (DIVB) allows you to restore the star diaognal to viewing position instantly and easily without using excessive force! Read more:

BiNOTRON-27 FAQs
New!! This Denk Binoviewer Works On Any and Every Scpope giving three magnification factors instantly. Both The syandard Binoviewer Virsion and The Denk II Premium Version Include the 2" OCS Lens System and a Dual Arm Power switch!

BINOTRON-27 Super System
WOW!! Brand New From Denkmeier Optical!  We engineered the BINOTRON-27 from the ground up. After 12 years, It was time for us to go back to the drawing board and create the ultimate Binoviewer. 

"Using our very best people, every part including the body is custom designed from scratch, drawing from my 12 years of fulltime experience in designing Binoviewers and optical peripheries for the ultimate in Binocular Astronomy!" -Russ Lederman/Founder of Denkmeier optical and Inventor of the Power Switch and OCS System

But I Own Several Telescopes!
Using More Than One Telescope?
                                
Please Select From Choices Below



Denk HI Def Filters
BIG SALE!!!! INTERNET ONLY. ORDER HERE FOR GREAT DISCOUNTS!

Denkmeier Eyepieces
Also Available as Singles! New D14 Eyepiece Review on cloudynights.com (Link)



The Top-Rated Denkmeier Eyepieces are availble as Matched Pairs or as Singles
Our D21s and D14s have been designed specifically with binoviewing in mind. Over one year in the making, users are raving about the awesome contrast delived by way of our super efficient multi-coatings. We use only the finest Japanese raw glass for these and each optical set is carefully examined with loupes in our Hauppage NY, USA facility and then assembled as a pair and finally tested in a Denkmeier Binoviewer before being shipped to the customer. Superb and accurate maching of all of the anodized aluminum housings mean perfect image merges everytime. The 20mm eye relief and 65 degree field of view provide an amazing porthole-like effect. They are specially designed to provide maximum illumination with our Power x Switch Systems. (Photo Shows Optional Eyepiece Vaults No Longer Available)

Hydrogen Alpha
Viewing The Sun?
                                
Please Select From Choices Below

Hydrogen Alpha Use
How To Use Your Denk Binoviewer With H-a

World Class Solar observers (like Greg Piepol who took the image used for this link) are now viewing our nearest star in the narrow bandpass of H-a with Denk Binoviewers and D21 Eyepieces. Be sure to read this section and get ready to start viewing The Sun with both eyes! You won't be disappointed. For serious Solar observers, the Denk II's amazing contrast when used for H-a observation is gaining kudos from the most experienced H-a observers in the world.


New! Solar Observing
Denkmeier Optical is now offering a line of new and innovative products for H-a Solar Observations. When we re-located our Operations to NY in the Spectrum thin Films facility, this created a fantastic opportunity for us to conduct R&D in the H-a Etalon Filtertration arena.

Newtonians (and Mak-Newts)

By selecting this, you will be directed to information for all Denk Binoviewer Systems designed for use with Newtonians. Please note that other telescope designs that are also compatable are listed in parenthesis next to "Newtonians" in the link.  So, if you have a Mak-Newt, use this selection as well.

 


P.S.T." Personal Solar Telescope by Coronado
Psssst.....You can now use any Denkmeier Binoviewer with your P.S.T." for amazing two-eyed views of the Sun in H-a light. We produced this very versatile corrector with the same super-high quality specs as our other optical systems. Best of all, it operates at 1.5X and also 2.6X! Click on the picture for expanded information. Very economically priced too!

Refractors (Also The TAK FSQ 106, Classical Cassegrains, Tak Mewlons, TEC Maksutov Cassegrains, RCs)
By selecting this, you will be directed to information for all Denk Binoviewer packages designed for use with Refractors. Please note that other telescope designs that are also compatable are listed in parenthesis next to "Refractors" in the link. So, if you have a Mewlon, a Maksutov Cassegrain,  or Classical Cassegrain for example, use this selection.

Refractors,NEwt,SCTs, Mak-Cass Etc.

By selecting this, you will be directed to information for all Denk Binoviewer Packages designed for use with Refractors, Newtonians and Schmidt Cassegrain Telescopes (SCTs). Importantly, use this link only if you intend to use all of these telescope types with your Denk Binoviewer System. Please note that other telescope designs that are also compatable are listed in parenthesis next to Refractors/Newtonians/SCTs" in the link. So, if you have a Mewlon or Classical Cassegrain for example in addition to a Newtonian and SCT, and Refractor, use this link as well.


Refractors/Newtonians (and Classical Cassegrains, Mewlons, TEC Maks, Mak-Mewts)

By selecting this, you will be directed to information for all Denk Binoviewer Systems designed for use with Refractors and Newtonians. Importantly, use this link only if you intend to use both telescope types with your Denk Binoviewer System. Please note that other telescope designs that are also compatable are listed in parenthesis next to "Refractors/Newtonians" in the link.  So, if you have a Newtonian or Mak-Newt and also a Mewlon or Classical Cassegrain for example, use this selection as well.

 


Refractors/SCTs (and Classical Cassegrains, Mak-Mewts, Maksutovs, Mewlons, TEC Maks)

By selecting this, you will be directed to information for all Denk Binoviewer Systems designed for use with Refractors and Schmidt Cassegrain Telescopes (SCTs). Importantly, use this link only if you intend to use both telescope types with your Denk Binoviewer System. Please note that other telescope designs that are also compatable are listed in parenthesis next to "Refractors/SCTs" in the link.  So, if you have a Mewlon or Classical Cassegrain for example in addition to an SCT or Maksutov, use this link as well.


SCTs (and Maksutov Cassegrains ex; ETX,Questar, Meade, Intes Micro)
By selecting this link, you will be directed to all Denk Binoviewer Systems that will allow operation with your Schmidt Cassegrain Telescope (SCT). Please note that other telescope designs that operate similarly with our Binoviewers are in parenthesis next to this SCT link. If you own one  of them, use this selection as well.

Video Link Tutorials

NEW. Here we provide links to video clips explaining how to use the BINOTRON-27 Super System and other Denkmeier Products. Russ Lederman will be adding video clip links regularly. If there is something that you feel can be explained, please email us! We will record add a video link here.


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Products

#150 Cell For Coronado Blocking Filters
The #150 Cell For Coronado Blocking Filters
This 1.25" Cell is Fully Multi-Coated (FMC) and threads into the 1.25" Coronado Star Diagonals that contain either the 5mm, 10mm, or 15mm blocking filters. It attaches by way of male threads to the telescope-side filter threads on the coronado BF Diagonals. Read about the #150 Cell where we explain whether you need to add this optional cell or if you may already have a substitute cell already contained in your Binoviewer Package.

#R1 Power x Switch Star Diagonal
The #R1 2" Power x Switch Star Diagonal
Diagonal #R1 is made to allow multi-magnification of most binoviewers when used in Refractors. Just add any Denkmeier Binoviewer (purchased ala carte) and #R1 will allow the Denk Binoviewer to reach low, mid, and high magnifications with a single pair of eyepieces. Single eyepieces also have a multi-magnification function. This diagonal also includes our special 2" Low Power S Cell that threads directly into the telescope-side diagonal housing. This cell allows #R1's eyepiece-side Power x Switch to function when using a binoviewer. The Dovetail Connector is included and will allow the user to change the focusing range to suit a particular refractor when using a Denk Binoviewer. As with all of our Star Diagonals, this unit is available in 97% enhanced silver or 99% Dielectric Coatings (add $120). Remember to add an ala carte Denk Binoviewer!

Tak FSQ 106
This R1 Power x Switch Star Diagonal is available in a special version for The Takahashi FSQ 106 Refractor. This version includes a special adapter that connects R1 to the Tak FS106 visual back. The Optical Adapter (included) contains a specifically designed optical element that allows R1 to reach focus with the Denk Binoviewer at three magnifcations with a single pair of eyepieces: 1.4X, 2.5X and 3.5X. The other Non-Optical Adapter (included) connects R1 to the Tak visual back and contains no optical element. This allows single 2" and 1.25" eyepieces to be used with the R1 Diagonal at 1X (normal power) and also allows a barlow effect by way of the multiplying optic in the Power x Switch. Note that the opposite Power x Switch Arm does not function when single eyepieces are being used and the non-optical adapter connects the R1 Power x Switch Diagonal to the Tak visual back.

Select: "R1 for FSQ" ($50 additional compared to #R1 for other refractors, and specify Dielectric ($120 additional) or Silver enhanced coatings. Pictorials will be available soon.

Add the Denk II Binoviewer in the "Binoviewer Ala Carte" section found in the left margin of all pages on this web site. Remember that for best illumination, our D21 Eyepieces are optimized for all Denk Binoviewer Systems and Diagonals and are made in USA and assemble and tested as matched eyepiece pairs. Performance is awesome, we guarantee it!

Note: You may choose  "Short Tube" diagonal or "Regular Tube" diagonal.  Why a Shorty? If you also plan on using an SCT that is smaller than 10", it is recommended that you choose the option of "Shorty Tube Diagonal"  and then add a "Shorty SCT Adapter" so that the #R1 Power x Switch Diagonal may be used with the SCT in addition to your Refractor. The Shorty Tube was designed to allow "swing-through clearance" for smaller SCTs so that the base of the fork mount is not contacted by the star diagonal bottom.

All #R1 Diagonals including the FSQ version, include the typical telescope-side tube that slips into any female 2" focuser. When the FSQ is used, this tube is removed and instead, the included FSQ Adapters are used to connect to the TAK106. However, FSQ owners may have other scopes and the diagonal is designed to convert to and operate as any 2" diagonal does should the need arise.

#R2 Power x Switch Star Diagonal
The #R2  Power x Switch Star Diagonal
This is one amazing diagonal. We designed this for refractors that can handle a little extra weight and it has two 2" format Power x Switch devices that produce a wonderful range of magnifications with any single eyepiece or a binoviewer. Our #R2 Power x Switch Star Diagonal allows a Denkmeier Standard or Premium Denk II Binoviewer as well as some other binoviewers to work at up to 6 magnifications with only one pair of eyepieces in most Refractors. Add a Standard or Premium Denk II Binoviewer purchased ala carte to your #R2 Power x Switch Star diagonal and typical Refractors will operate at up to 7 magnifications with a single eyepiece. Includes a silver enhanced 97% reflective 1/10 Wave mirror  Also available with a 99.4 %, 1/10 Wave Dielectric Mirror (add $120).

1.25" Denk Hi-Def Planetary Filter
ON SALE NOW! 1.25" Denk Hi-Def Planetary Filter. Dual Band Coatings enable Enhanced Surface Detail to be seen on Mars, Jupiter and Saturn. Features 1.25" Male Threads for 1.25" Eyepieces or any Adapter With Female 1.25" Threads. Works Perfectly in Our Filter Switch Systems ***Made in USA by Denkmeier Optical*** Shipped by US Priority Mail in USA for $4.95 Addiotional Which is Added to The Shopping Cart Price. Outside of USA, Shipping is Our Actual Cost. Never an Additional S/H Charge When Added to a Binoviewer or Power Switch Star Diagonal Order.

1.25" Denk Hi-Def UHC Filter

ON SALE!     1.25" Denk HI-Def UHC Filter  
Features 1.25" Male Threads for Eyepieces or any Adapter With 
Female 1.25" Threads. Works Perfectly in Our Filter SWitch Systems! 
***Made in USA by Denkmeier Optical*** Shipped by US Priority Mail 
in USA for $4.95 Addiotional Which is Added to The Shopping Cart Price. 
Outside of USA, Shipping is Our Actual Cost. Never an Additional S/H 
Charge When Added to a Binoviewer or Power Switch Star Diagonal Order.


1.25" Part O/ Cell #150 For Coronado Filters
Parts O & The #150 1.25" Cell For Coronado Blocking Filters
This pair allows any Denk Binoviewer to reach focus at Low Power in Solarmax equipped scopes that use the Coronado 1.25" Blocking Filters (B5,B10 or B15). For Denk Binoviewers with no Power x Switch. The Part we call Part O is actually a 1.25" Nosepiece for Denk Binoviewers and contains an optical doublet that is Fully-Multi-Coated (FMC). The other 1.25" #150 Cell threads into the ffilter threads on the Telescope-Side of the BF filter diagonal. When used together, low 1.2X Magnification is the result. If the Hollow nosepiece for the Denk Binoviewer without the doublet is used in combination with the BF diagonal and #150 cell, 2.5X magnification results and an outward focus position is required.

1.25" Step Down Adpater
Using 1.25" Filters: $8 per 1.25" Step-Down Adapters. These may be ordered individually. Any 1.25" Step Down Adapter will fit into both Left and Right 2" Carriers. Order one for each 1.25" Filter. It is a good idea to have a 2" Carrier for each Step-Down Adapter so that the 1.25" Filter may remain loaded into the Step-Down Adapter and the Step-Down Adapter may remain loaded into the 2" Carrier, protected within the plastic case included with all 2" Carriers. In this way, either 1.25" Filters pre-loaded in such a way, or 2" Filters loaded in their designated 2" Carriers may be instantly inserted into the Main Filter Switch Housing. This takes seconds! Illustration shows the larger 2" Carrier with included hex tool engaged to secure the 1.25" Step-Down Carrier that has been loaded with a 1.25" Moon Filter. A separate drop-down window is provided for ordering plastic cases. Remember that all 2" Carrier Pairs ($20 per pair) include two plastic cases and that your 1.25" Step-Down Adapters do not include a plastic case. usually, the 1.25" Step-Down Adapters are stored within a 2" Filter Carrier and the plastic case that was included with that 2" Filter Carrier.

2" Denk Hi-Def OIII Filter

ON SALE!     2" Denk HI-Def OIII Filter  
Features 48mm Male Threads for 2" Eyepieces or any Adapter With 
Female 48mm Threads. Works Perfectly in Our Filter SWitch Systems! 
***Made in USA by Denkmeier Optical*** Shipped by US Priority Mail 
in USA for $4.95 Addiotional Which is Added to The Shopping Cart Price. 
Outside of USA, Shipping is Our Actual Cost. Never an Additional S/H 
Charge When Added to a Binoviewer or Power Switch Star Diagonal Order.


2" Denk HI-Def UHC Filter

ON SALE!     2" Denk HI-Def UHC Filter  
Features 48mm Male Threads for 2" Eyepieces or any Adapter With 
Female 48mm Threads. Works Perfectly in Our Filter SWitch Systems! 
***Made in USA by Denkmeier Optical*** Shipped by US Priority Mail 
in USA for $4.95 Addiotional Which is Added to The Shopping Cart Price. 
Outside of USA, Shipping is Our Actual Cost. Never an Additional S/H 
Charge When Added to a Binoviewer or Power Switch Star Diagonal Order.


2" Dielectric Filter Switch Star Diagonal
The new Filter Switch Star Diagonal. Collimated in our NY facility, this 2" Star Diagonal features 99% Dielectric Mirror for $389. The 2" Filter Switch includes two 2" Filter Carriers. Order optional 1.25" Step-Down Filter Carriers or additional 2" Filter Carrier Pairs so that all of your filters are ready to load into the Filter Switch in seconds!

2" Filter Switch Carriers
Adding these optional 2" Filter Carrier Pairs allows you  to load all of your 2" Filters so that they are ready to insert into the Filter Switch Housing. These 2" Format Carriers accept typical 2" (48mm) filters. $20 includes one Pair of 2" Carriers and includes a plastic case for each carrier. Shipping is free when purchased with a Filter switch System. Otherwise, $5.50 priority shiopping in USA will be added to shopping cart total when these carriers are ordered after the Filter Switch System has been delivered previously. So, order at time of the Filter switch purchase to save on shipping!  Note that stacked filters such as variable polarizing filters are probably not suitable for use and may be to high in profile to fit. 

Add Filter Carriers


Adding Filter Switch to Newtonian and Universal Power X Switch Systems
This Filter Switch is an "add-on" for those who currently own a Denk II Newtonian or Universal Power x Switch System. Add a Filter Switch to your Denk II Newtonian Power x Switch System or your Denk II Universal Power x Switch System. Also available for Standard Newtonian Power x Switch Systems though an upgrade to the 2" Newtonian OCS Cell is required ($149). Blink Planetaries all night long. Works great!

Adding Filter Switch to SCT/Refractor Binoviewer Power Switch
This Filter switch is an "add-on" for those who currently own an SCT or Refractor Power x Switch System. This Filter Switch comes ready to dock to any Denk Binoviewer or Binoviewer with an SCT or Refractor Power x Switch. It will include a Special 2" Nosepiece that replaces your current Binoviewer 2" nosepiece. (For Newtonian or Universal Power x Switch Systems, choose "Filter Switch for Newtonian/Universal Systems). Add Filter Switching to your Power Switching for a completely great astronomical experience!

Bino-Corrector For P.S.T.
Use your Denkmeier Binoviewer in your P.S.T. Solar Telescope! Be sure to add some D21 Eyepieces, considered the ultimate for H-a viewing. Click on the Picture and use the link that is provided after to learn more about the Denkmeier P.S.T. Bino-Corrector!

BINOTRON-27 Ala Carte
New! BINOTRON-27 Ala Carte.

BINOTRON-27 SCT Super System
FOR SCTs and REFRACTORS!! Complete with our 99% Dielectric Quartz Mirror Star Diagonal with our new  Inter-Locking Visual Back (IVB) Feature!! Incudes OCS A-37 Optical Cell to elimate most of the optical light path requirement. Works for refractors too!

Credit Cards: IMPORTANT CREDIT CARD INFORMATION! Customers using credit cards will be charged the fee that we are charged by our provider, if that credit card is declined when we attempt to charge. Please be accurate when inputting all information and notify your bank who issued the card that a charge will occur. This is especially a requirement for overseas orders.

Input the VCode which is a 3 digit code on the back of your credit card in the area that reads "additional comments" please. For AMEX this code is a 4 digit code on the front of the card. Remember to add this number under "additional comments" field when checking out or delays in filling your order will occur.

BINOTRON-27 Super System

  • Note: Credit Cards: Customers using credit cards will be charged the fee that we are charged by our provider, if that credit card is declined when we attempt to charge. Please be accurate when inputting all information and notify your bank who issued the card that a charge will occur. This is especially a requirement for overseas orders. While you may be inputting the security code on the back of the card in the space provided in the checkout section, we are not recieving it.  *****Please add V-code numbers on the back of credit cards when checking out in the shopping cart. Place the 3 (Visa/MC/Disc) or 4 digit code (Amex) in the  "Comments" box. Thank You********

    SELECT THIS PRODUCT FOR 30 DAY INTRODUCTORY SALE PRICE!!!! "Click On BINOTRON-27 image For Proper Window Size"
    BINOTRON-27 Super System Includes:

Complete BINOTRON-27 Binoviewer and Super System Accessories:
Power x Switch System + All Spacer Tubes and Multi-Purpose OCS Cell (37mm Optical Lens)
Machined and Engraved Aluminum Caps and Eyepiece Holder Plugs
Aluminum Case
Available Options: 
OCS-A45 Clear Aperture 45mm Add $149  (Note:Replaces 37mm Clear Aperture OCS Lens and Cell)
Filter Switch System: Add $249  Accepts Two 2" Filters (Contains two removable 2" Carriers)
Extra 2" Filter Carriers: $15 each
1.25" Stepdown Adapters: Allows your 1.25" Filters to be used (recommend adding a 2" Carrier for each)

Be sure to check our Filter Page! All of our filters are coated on site in NY using our state pof the art Ion Beam Sputtering machine (IBS)

Shipping is added after we know the cost. The cost depends on where the order is being shipped to and by what method. We ship worldwide! Your Card is never charged until the package is ready to leave our Hauppauge, NY facility.



Binoviewer Power x Switches
Binoviewer Power x Switches
The revolutionary Binoviewer Power x Switch is a patent pending Denkmeier Optical innovation that has changed the way people all over the world use their telescopes. During previous years of visiting star parties and speaking with amateur astronomers, we found that one of the key objections that they had to using binoviewers was that multiple pairs of eyepieces would have to be purchased. The Power x Switch not only eliminates this problem but makes observing objects at multiple magnifications a wonderful experience. In short, you'll do it! Without having to worry about stepping off of a ladder and loading other eyepieces into your unit, just push in a Power x Switch Arm, quickly re-focus and there it is: The Dumbell's central star. When you want to see it from a wider persepective, move a Power x Switch Arm to the "OUT" position. It's that easy and absolutely encourages you to examine each object at several magnifications. Add one today. If you have an existing Standard or Denk II Binoviewer without the Power x Switch System, it's easy to order and installs quickly with no tools. Our Power x Switch innovation is sold for Denkmeier Binoviewers only. We take our patents seriously and appreciate the fact that other astronomy manufacturers have cooperated in respecting our right to invent and then provide our unique designs to the community. Check out the information by clicking on the Power x Switch picture. We explain the differences in our Power x Switches and let you know what to order.

ClamShell Mount for Spectrum 60
This fully machined Clamshell Mount will allow you to slide the Spectrum 60 tube assembly to a point where the entire upgraded PST will become balanced on your tripod. This mount has tripod sockets so that you phopt tripod can still be used but balance can now be "set" by moving the Spectrum 60 tube to an ideal position. The ClamShell Mount is also ready to recieve a Sol Searcher solar finder available from Tele Vue for an additional $29. Just note in the shopping cart under "Comments" that you want to add a Sol Searcher to this mount and we will add it to the order.

Note that we will begin production of this item only after 50 units have been ordered. Many of our Spectrum 60 customers have expressed an interest in both the aluminum case and the ClamShell Mount. When we feel that the response warrants production, we will proceed and may require a 50% deposit at that time.

Complete Product List
This is a complete list of our Binoviewer Systems and other products. By clicking on the product, you will be brought to that item and can add it to your shopping cart.

Customer's Pictures!

D14 Matched Eyepieces
The D14 Eyepieces
One Matched Pair of the new, D14 Eyepieces from Denkmeier Optical.  Use in your Denk Binoviewer for awesome high contrast planetary, Lunar and Deepsky views of The Heavens. You deserve the best.
New D14 Eyepiece Review on cloudynights.com (Link)


Note: An Aluminum Eyepiece Carrying case is $49 only with the purchase of both D21, and D14 pairs. The case may be added as an option ($49) with the purchase of one pair of either the D21s or D14s as well. Just leave a note under "Comments" when checking out of the shopping cart and we will add the case and charge accordingly. Vaults are Optional $49 per pair items.


D14 Single Eyepiece
Single D14 Eyepiece. This eyepiece is becoming a legend among the best. $329 includes a protective plastic bolt style container and plastic lens caps. This is the same eyepiece included in our matched pairs used in our Denk Binoviewers.  We will add a charge of $15 UPS in USA for S/H, $35 in Canada or overseas via US Postal Global Express.
New D14 Eyepiece Review on cloudynights.com (Link)


D21 Single Eyepiece
Yes, D21s and D14s are available as single eyepieces for those not wishing to use a binoviewer. D21 is $289 and includes a plastic bolt style protective holder and plastic lens caps. Use this shopping cart entry to order a single D21 and you will be charged $289 + $15 S/H UPS in USA, or $35 Global Express US mail for Canada and overseas.

Delivery Schedule

Denk Hi-Def 1.25" OIII

ON SALE!      1.25" Denk HI-Def OIII Filter  
Features  1.25" Male Threads for 1.25" Eyepieces or any Adapter With Female 1.25" Threads.
Works Perfectly in Our Filter SWitch Systems! ***Made in USA by Denkmeier Optical*** Shipped by
US Priority Mail in USA for $4.95 Addiotional Which is Added to The Shopping Cart Price. Outside of USA, Shipping is Our Actual Cost. Never an Additional S/H Charge When Added to a Binoviewer or Power Switch Star Diagonal Order.


Denk II Premium Binoviewer With SCD Holders/Case
We tested the "real-world" performance of The Denk II in many telescope designs before going ahead with production of this Binoviewer. The prisms are polished to 1/8 wave surface accuracy and include special baffling to control off axis reflections. Super transmissive coatings formulated to provide maximum contrast throughout the visible spectrum are all features that are rolled into our Premium Denk II Binoviewer. SCD Holders and fully machined, and laser engraved aluminum eyepiece holder dust plugs are standard inclusions.  This is a finely tuned optical instrument worthy or being called our "Premium" Denk II Binoviewer.
Includes Super Quality Metal case.

Denkmeier Facility

Fillter Switch for Photography
This Filter Switch quickly docks to any camera using a T-ring. Whether using a conventional SLR like the Pentax K1000 pictured, or a new Digital SLR, this Filter switch gives you the ability to move filters in and out of the light path of your camera instantly. Add optional pairs of the 2" carriers or 1.25" Step-Down Adapters. Protects your filters from dew and dust!

Filter Switch For Denk Bino Power Switch Systems
Ready to buy a brand new Denk II Power x Switch System?  $249 includes the special Spacer Tubes and Dovetail Connector for Docking the Filter Switch to the Binoviewer's Dual Arm Power x Switch. Filter Switch and Power Switch the night away while exploring the Cosmos!

Filter Switch For Existing Power x Switch Star Diagonal
This Filter Switch is installed on any existing Denkmeier Power x Switch Diagonal. We do the installation after you ship the diagonal to us. This is not a user-installed. Please follow the instructions for shipping the #S1,#S2, #R1, or #R2 Power x Switch Diagonals to us, outlined on the web page for this retro-fit.

Filter Switch for New SCT/Refractor PXS System
Ready to buy a brand new Denk II SCT or Refractor Power x Switch System? Add a Filter Switch at the time of purchase for only $249 complete. Includes a Filter switch with a 2" Nosepiece and Connector for Docking to the Binoviewer's Power x Switch. Price includes shipping when added to a new Denk II SCT or Refractor Power x Switch System.

Filter Switch Retro-Fit to William Optics 2" Diagonals
Add a new Denkmeier Filter Switch to your 2" William Optics Star Diagonal. 1/2" Additional in-travel should be available with your refractor. Please check before sending us your star diagonal. WILL NOT FIT TO QUARTZ MIRROR WO DIAGONALS.

INSTA-SWITCH BARLOW
New INSTA-SWITCH BARLOW for Newtonians and Refractors. In-Stock though check for availibility of this hot new product! Normally ships within one week. Weight is 22 oz. Optional 2'/1.25" adapter is an additional 3.2 oz.  "Choose One" drop-down windows allows you to add a 2"/1.25" eyepiece adapter for using 1.25" eyepieces.   Order Now!!  Actual Shipping Cost Will Be Added When We Ship.

IVB 2" SCT Star Diagonal
NEW!!! Denk IVB  2" Star Diagonal for SCTs with IVB (Inter-Locking Visual Back). It's a very new, super secure, and easy to use
2" Star Diagonal for your SCT. Will not freeze up on those cold nights. No need to use tremendous force to secure the star diagonal and prevent unwanted rotation downward as your scope slews to a new object! This is easy, and secures your diagonal after moving it to the proper position for viewing........ WITHOUT the need for excessive force! read more...........

New Denk HI Def Filters!
New! Denkmeier Optical presents our HI Def Filters. Coated in our Spectrum thin Films Laboratory in Hauppage, NY. All Hi Def filters are made with the highest quality glass polished to Lamda/8 or better and anti-reflective coated. On sale now!

New Lunt Optical Adapter
New Lunt Optical Adapter allows BINOTRON-27 to be used with any Lunt Solar Scope with a Lunt BF Diagonal.

NEW!! Collitron Reticle

Newtonian Focal Reducer System

Redutcion in your Dob? Yes! Click on More below:


OCS-A45
INTRODUCTORY PRICE FOR LIMITED TIME!!! Wow! So many users of new large FAST dobs have asked if I could make a full aperture OCS Lens that would grab peripheral rays to the max. Well, this optic is not only super quality, fully multi-coated and the same focal length as our lowest power OCS optic but it is 45mm clear aperture. You can see from the photo that we could not make it any larger! We do need to house it in a beautiful precision anodized cell and it still must enter a 2" focuser, and it will. We check every single mounted lens on our own flourite refractor in our lab for optical performance and any aberrations. Suffice to say that these optics are absolutely beautiful in appearance and performance! Available starting in Mid August. Order NOW!

One Matched Pair Of D21 Eyepieces
One Pair Of Matched D21 Eyepieces (In-Stock)
Includes plastic bolt cases and plastic lens covers. Always In-stock!

New D14 Eyepiece Review on cloudynights.com (Link)


Note: An Aluminum Eyepiece Carrying case is $49 only with the purchase of both D21, and D14 pairs. The case may be added as an option ($49) with the purchase of one pair of either the D21s or D14s as well. Just leave a note under "Comments" when checking out of the shopping cart and we will add the case and charge accordingly. Vaults are Optional $49 per pair items.


Optical Cell #150/#33 Nosepiece
This is the #150 Optical Cell for the Coronado BF 5,10,15 1.25" diagonals. Choose this for reaching focus with your Binotron-27 with power switch. This cell allows three magnifications to occur with the Power Switch attached to the Binotron-27. Note that it also includes a 1.25" nosepiece for the Binotron-27. The 1.25" nosepiece must be used in the Binotron-27 Power Switch after removing all 2" sections in order for the Binotron-27 to fit into the 1.25" eyepiece holder of the Coronado BF diagonal.

Power Switch Diagonal #R2 (click here for details)
The #R2  Power x Switch Star Diagonal
Now Only available in 99% Dielectric Mirror Coatings. The Mirror substrate is quartz.
This is one amazing diagonal. We designed this for refractors that can handle a little extra weight and it has two 2" format Power x Switch devices that produce a wonderful range of magnifications with any single eyepiece or a binoviewer. Our #R2 Power x Switch Star Diagonal allows aBinotron-27 as well as some other binoviewers to work at up to 6 magnifications with only one pair of eyepieces in most Refractors. Add a Binotron-27 purchased ala carte to your #R2 Power x Switch Star  Diagonal and typical Refractors will operate at up to 7 magnifications with a single eyepiece. Quartz 1/10th Wave Mirror with 99% Dielectric Coatings.

Power x Switch Diagonal #R1 (click here for details)
The #R1 2" Power x Switch Star Diagonal
Diagonal #R1 is made to allow multi-magnification of most binoviewers when used in Refractors. Just add any Denkmeier Binoviewer (purchased ala carte) and #R1 will allow the Denk Binoviewer to reach low, mid, and high magnifications with a single pair of eyepieces. Single eyepieces also have a multi-magnification function. This diagonal also includes our special 2" Low Power S Cell that threads directly into the telescope-side diagonal housing. This cell allows #R1's eyepiece-side Power x Switch to function when using a binoviewer. The Dovetail Connector is included and will allow the user to change the focusing range to suit a particular refractor when using a Denk Binoviewer. As with all of our Star Diagonals, this unit is available in 97% enhanced silver or 99% Dielectric Coatings (add $120). Remember to add an Ala Carte Denk Binoviewer! Filter Switch Option is a fantastic choice as well.


Tak FSQ 106
This R1 Power x Switch Star Diagonal is available in a special version for The Takahashi FSQ 106 Refractor. This version includes a special adapter that connects R1 to the Tak FS106 visual back. The Optical Adapter (included) contains a specifically designed optical element that allows R1 to reach focus with the Denk Binoviewer at three magnifcations with a single pair of eyepieces: 1.4X, 2.5X and 3.5X. The other Non-Optical Adapter (included) connects R1 to the Tak visual back and contains no optical element. This allows single 2" and 1.25" eyepieces to be used with the R1 Diagonal at 1X (normal power) and also allows a barlow effect by way of the multiplying optic in the Power x Switch. Note that the opposite Power x Switch Arm does not function when single eyepieces are being used and the non-optical adapter connects the R1 Power x Switch Diagonal to the Tak visual back.

Select: "R1 for FSQ" ($50 additional compared to #R1 for other refractors, and specify Dielectric ($120 additional) or Silver enhanced coatings. Pictorials will be available soon.

Add the Denk II Binoviewer in the "Binoviewer Ala Carte" section found in the left margin of all pages on this web site. Remember that for best illumination, our D21 Eyepieces are optimized for all Denk Binoviewer Systems and Diagonals and are made in USA and assemble and tested as matched eyepiece pairs. Performance is awesome, we guarantee it!

Note: You may choose  "Short Tube" diagonal or "Regular Tube" diagonal.  Why a Shorty? If you also plan on using an SCT that is smaller than 10", it is recommended that you choose the option of "Shorty Tube Diagonal"  and then add a "Shorty SCT Adapter" so that the #R1 Power x Switch Diagonal may be used with the SCT in addition to your Refractor. The Shorty Tube was designed to allow "swing-through clearance" for smaller SCTs so that the base of the fork mount is not contacted by the star diagonal bottom.

All #R1 Diagonals including the FSQ version, include the typical telescope-side tube that slips into any female 2" focuser. When the FSQ is used, this tube is removed and instead, the included FSQ Adapters are used to connect to the TAK106. However, FSQ owners may have other scopes and the diagonal is designed to convert to and operate as any 2" diagonal does should the need arise.

Power x Switch Diagonal #S1 (click here for details)
Star Diagonal #S1 
Use this with your SCT if plan on doing single eyepiece observations only (non-binoviewer)

Why will every SCT user own one of these soon? This very important Denkmeier innovation allows an owner of an F/10 SCT to have a focal reducer and Barlow incorporated into a top quality 2" Star Diagonal. This means that 3 instant magnifcations with a single eyepiece is at your fingertips. A Denkmeier D21 65 degree Widefield  eyepiece suddenly becomes a 45mm 65 degree widefield eyepiece. Move the reducer arm to "OUT" and it reverts back to a 21mm eyepiece. Move the opposite Power x Switch Arm to the "IN" position and it becomes a 10.5mm eyepiece. The 65 degree apparant field is maintained in all Power Switch settings. In a few years, these diagonals will be standad equipment with all F/10 SCTs. Includes the 2" Power x Switch Diagonal #S1, 2"/1.25" eyepiece adapter, thread-on SCT visual back which fits all SCTs from 8"-16" in diameter. Comes with an engraved aluminum eyepiece holder plug and a 2" machined aluminum sealing cap for the telescope side diagonal tube.

Power x Switch Diagonal #S2(click here for details)
Power x Switch Star Diagonal #S2
Use this for both binoviewing and single eyepiece viewing in your SCT (The #S2 is optimized for Binoviewing but works with single eyepieces as well. An extension is required if single eyepieces are to achieve the amount of focal reduction produced with #S1)
For SCTs Using Binoviewers All Power x Switch Star Diagonals are Patent Pending. #S2 is designed for use with binoviewers in an SCT and will operate with single eyepieces as well. The wonderful ability to call upon focal reduction, normal and 2X magnifications at any time instantly is yours. The new  #S2 Power x Switch Star Diagonal allows 3 magnifications with your binoviewer and three magnifications with any single eyepiece. Buy an ala carte Standard or Denk II Binoviewer and you will not only have a Binoviewing System that operates at three magnifications, but your single eyepieces will operate at three magnifications as well. Available with a Silver Enhanced 97% reflective mirror or a Dielectric 99% reflective mirror (add $120).

Power x Switch Star Diagonal #S2
Power x Switch Star Diagonal #S2
For SCTs Using Binoviewers All Power x Switch Star Diagonals are Patent Pending. #S2 is designed for use with binoviewers in an SCT and will operate with single eyepieces as well. The wonderful ability to call upon focal reduction, normal and 2X magnifications at any time instantly is yours. The new  #S2 Power x Switch Star Diagonal allows 3 magnifications with your binoviewer and three magnifications with any single eyepiece. Buy an ala carte Standard or Denk II Binoviewer and you will not only have a Binoviewing System that operates at three magnifications, but your single eyepieces will operate at three magnifications as well. Available with a Silver Enhanced 97% reflective mirror or a Dielectric 99% reflective mirror (add $120).

Spectrum 60 Optional AluminumCase
Aluminum carrying case for your Spectrum 60 Upgraded PST Scope. The foam insert that you receive and that your Spectrum 60 was shipped with in a cardboard box will fit in this new aluminum case. Simply transfer the foam inserts into this new aluminum case.

Spectrum 60 Upgrade
ONLY $499 + Shipping. We replace your 40mm lens and entire tube assembly with the new Spectrum 60 three-element Objective lens and anodized three-piece optical tube. We add a really nice machined focuser knob as well and return in a cardboard heavy duty box with custom foam inserts. Add an optional clamshell mount ($99) and/or a metal case ($129).

Spectrum 60 Upgrade for PST

Spectrum 60
The brand new Spectrum 60 Upgrade for your PST! Increases objective aperture by 50% for substantial gains in resolution.  It really works!!


Spectrum Thin Films News!

Standard Binoviewer With SCD Holders/Case
Setting A New Standard
It's true. An historic review called "Binoviewer Shootout In The Desert" by Jim Gutman assembled 9 observers for a long night of side by side comparisons involving 5 binoviewers. We hadn't produced the Denk II at that time but suffice to say, The Standard came out very well.  After the review, several improvements were made to our Standard binoviewer. It now includes our special SCD Holders and the old Delrin slip-in holders while effective, were phased out long ago. Read more about the Denk Standard here by clicking on the photo! This version includes SCD holders.  Includes super high quality Metal case.


Star*Sweepers & Multipliers
Note: The 2" SCT Star*Sweeper is the cell used in the Cloudy Nights article featuring the Collins I3 image intensifying eyepiece. The price is $149 + Shipping.

All of our optical components are custom ground and coated by our engineers to the highest specifications. These components feature Multi-Coatings on every air to glass surface (FMC) and high precision surface accuracy. All optical elements are housed in our anodized engraved cells. They are available in 1.25" or 2" format. These Denkmeier Components are suitable for single eyepiece usage or with your Denkmeier Binoviewer Systems. All of our cells are threaded to recieve filters in their corresponding format. All Multipliers & Star*Sweepers include machined caps. Click on the image for more details!

THE BIG EASY

Why Do We Call It The Big Easy?
Because our famous Standard Denk Binoviewer included in this Package has a BIG 26mm clear aperture but the price of this super economy package is EASY to afford. This system is also easy to use because a correcting system that allows focus in several magnifcations with Refractors, Newtonians and SCTs is also included. You'll never have a problem bringing focus to a pair of eyepieces and they will operate at two magnifications in any Refractor or Newtonian and three magnifications in an F/10 SCT including a focal reduction mode.  Click on the photo, read all about it.


The BIG EASY
Why Do We Call It The Big Easy? Note: Now Includes SCD Diopter Eyepiece Holders

Because our famous Standard Denk Binoviewer included in this Package has a BIG 26mm clear aperture but the price of this super economy package is EASY to afford. This system is also easy to use because a correcting system that allows focus in several magnifcations with Refractors, Newtonians and SCTs is also included. You'll never have a problem bringing focus to a pair of eyepieces and they will operate at two magnifications in any Refractor or Newtonian and three magnifications in an F/10 SCT including a focal reduction mode.  Click on the photo, read all about it.


THE BIG EASY
Why Do We Call It The Big Easy?

Because our famous Standard Denk Binoviewer included in this Package has a BIG 26mm clear aperture but the price of this super economy package is EASY to afford. This system is also easy to use because a correcting system that allows focus in several magnifcations with Refractors, Newtonians and SCTs is also included. You'll never have a problem bringing focus to a pair of eyepieces and they will operate at two magnifications in any Refractor or Newtonian and three magnifications in an F/10 SCT including a focal reduction mode.  Click on the photo, read all about it.


The Big Easy Package
Now Includes SDC Diopter Eyepiece Holders

Why Do We Call It The Big Easy?
Because our famous Standard Denk Binoviewer included in this Package has a BIG 26mm clear aperture but the price of this super economy package is EASY to afford. This system is also easy to use because a correcting system that allows focus in several magnifcations with Refractors, Newtonians and SCTs is also included. You'll never have a problem bringing focus to a pair of eyepieces and they will operate at two magnifications in any Refractor or Newtonian and three magnifications in an F/10 SCT including a focal reduction mode.  Click on the photo, read all about it.

The Premium Denk II Universal Power x Switch Package

The Premium Denk II Universal Power x Switch Package
This is our top of the line Denk Binoviewer System for use in all of your telescopes. The Denk II Binoviewer comes with a Dual Arm Power x Switch allowing three instant magnifications in Newtonians.  Refractors and SCTS also obtain three magnifcations with the Universal Power x Switch and the included Optical Corrector System (OCS). For those who want the capability of Power x Switching with a Denk Binoviewer in all three telescope designs, this package is a very good choice. If you currently own the telescope that was selected bring you here but you plan on adding other scope designs to your aresenal of observing equipment, this may be a good choice.

 


The Standard Universal Power x Switch Package

The Standard Universal Power x Switch Package
This extremely versatile system includes a Standard Denk Binoviewer with 2 SCD Holders, the Universal Single Arm Power x Switch, a 1.25" Optical Corrector System (OCS) that morphs into all corrector configurations necessary for reaching focus at multiple instant magnifications on Newtonians, Refractors and SCTs, and comes shipped in our Denkmeier locking aluminum case. If you only own the telescope that was selected in our Shopping Guide but plan on adding other scopes, consider this package.

 


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