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200 Short Johnson Road
Clayton, NC 
USA  27520

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         Products:

Eyepieces  

Adapters - Meade Scopes and ETX

Barlow Lenses  

Binoculars - Quality Modified

Binoviewers & Accessories

Camera Focus Adaptors

Camera Adapters - Universal

Converters

Correction Prisms for Newts

Diagonals

Extension Tubes

Eyepieces  

Eyepiece Comparisons

Focal Length Reducers

H-Alpha Accessories

Miscellaneous

Observers Hood - light blocking 

Planetary Fleece Blanket 

Power Mag Wheel - binoviewers

Power Mag Wheel - Eyepieces

PST Accessories  

Telecentric Barlow Lenses

Refractor Knobs

Zero Magnification Adapter

Ladies Corner

Saturn Earrings  

Astronomy Themed  Fleece Blanket 

Astronomy themed totes/purses

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Astronomy Accessory Links of 

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The New Black Night Diopters .

For a limited time get free SC Diopters with your BN binoviewer for $300 total. 

*AP, Denk and BW Self Centering Diopters* (Click) 

Full instructions for these Diopter adjusters.

About # 1  

A Diopter adjustment is a poor idea without a Self Centering holder regardless of the claims. The only two companies that have "True" Self Centering Diopters  are Siebert Optics and Denkmeier Optical that is with the exception of AP Baader Mark V. The rest use different eyepiece holding methods that do not require the expensive process of making Micro helical focusers and an all sides compression holder like Siebert Optics and the few other companies mentioned. 

The Siebert Optics model pulls ahead of the rest except 28mm AP in that it holds the eyepieces all the way down the barrel of the eyepiece so safety groves in the eyepieces are not a problem.  ( The compression Centering ring method SC eyepiece holder may have a problem here.)

About # 2  

This is were some Diopters fall flat on their face. They have no bottom eyepiece support. The eyepiece is supported at the top of barrel only and not at the bottom of the eyepiece barrel. This can be a problem with eyepieces that have a tall barrel and will bottom out at the bottom of the eyepiece holder instead of the top first. So some of your eyepiece barrels will show although seated all the way in as far as it will go. Siebert Optics holders are taller then most at 35mm deep rather then 25mm but the Siebert holders also have a catch at the bottom of the eyepiece holder. What is the real payoff here.  If you have an long barrel eyepiece and a short holder without a catch your eyepieces will not be carried up with the Diopter properly and if you have to change eyepieces you lose you Diopter setting and have to screw them down and start over again with the next set of eyepieces. Not so with these holders. If your eyepieces bottoms out before it is seated all the way in it will still be held at the bottom of the Diopter and will be identical to the other side. If you change eyepieces your setting are not lost. The bottom line is Siebert Diopters stand alone here with the exception 28mm AP.

About # 3  

This is were some Diopters fall flat on their face also. You can't lock them in place. Replacing the eyepieces are a two handed job. Diopter rotate off setting unless held during eyepiece changing. 

So there you have it. Everything that makes SC Diopters work RIGHT!

 Denk AP and BW optics

These binoviewers can use the same Diopter adjusters as the BN's. These are the best on the market bar none. "Product Service includes installation and  collimation".  

For AP and Denk II users : Remember the old Lapides eyepieces holders made originally for the AP Mark IV big binoviewers. They are no longer in production.  I have been considering a CNC self centering version of the famed non rotating Lapides Diopter adjusters. These would be the best Diopter adjuster yet since it eliminated any possibility of a rotational collimation errors. IF you would like a black Anodized version contact me through Email. If I get 10 requests for these I will make a CNC run. Satisfaction will  be guarantied with 60 day return policy and a 2 year defective parts and workmanship  repair warranty.

I really like the Lapides that came on my Mark IV and have already reconstructed  a pair that were damaged by a customer. This is an great design that is easily improved with a self centering eyepiece holders that are the only thing missing in this design. Price $399 charged on delivery