Self Centering eyepiece holder refits.

Fits most $200 binoviewer clones.

 Self Centering eyepiece holders Pair-$29. (BOsc)

Do you want to use your Burgess/Orion/ or similar Binoviewer and have  a fully Self Centering Diopter arrangement  Get rid of your white Nylon screws and merging problems.       Spring loaded Self Centering mechanism always give perfect centering. Effortless installation. If you have questions call or email.

Converters and ID enhancement for refractors and SCT's Diagonals

 Refractor nose replacement. This sells for $30. (WOrefdiagnose)

SCT visual connector replacement. This sells for $30. (WOsctdiagnose)

Or both for $50

Do you want to use your WO, AT, Denk, Orion, or other similar Diagonal with your refractor but can't because it is made for an Celestron SCT visual back. How about the other way around. You might have to purchase a whole second Diagonal to be covered. Here is the  solution in the picture below.

These are also better in one very important way. They have a larger CA inside the front tube then the OEM part does. 41mm is the max size in these diagonals. The Siebert Optics replacements are 45mm Dia. CNC machined and nicely baffled inside. These replacement nose attachments are what is needed . 

2" or 1.25" Adapter rings both male and female

This sells for $10 each or 2 for $15 (CON91R)

All rings are standard eyepiece and filter compatible.

Adapter shown: 2" standard Female inside treads. .

2" Male outside also available

.2" to 1.25" Super low profile and self centering. 

This sells for $30. (CON91SD)

These are also ideal in the 2" Black Knight Binoviewer.

Adapters are shown here in a 2" binoviewer.

1.25" to  2"  Converter

This sells for $65. (CON91st)

.965" to 1.25" Straight Converter

This sells for $30. (CON91STR)

1.25" Extension Tube 

providing 1.5" of extra travel.

$20 (125EXT)