Self Centering eyepiece holder refits.

Fits most $200 binoviewer clones.

 Self Centering eyepiece holders Pair-$49. (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. More info under picture.

The binoviewers that can use these are the ones that have the nylon screws and relatively thin eyepiece holder walls that they thread through that makes unscrewing them a hazard since it does not take many turns to have them fall out. On the unit above the eyepiece holder on the left is different then the one on the right. The left is too thick to use these refits. It was a later model eyepiece holder that had thicker walls for the screws to thread through. The right side had the thinner walls and the adaptors can fit over the holder for a proper attachment. So if your binoviewer eyepiece holder looks like the one below you are set.

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 . 

Custom adapters

Ex: 52mm male / 48mm Female. (CON5248)

Ex: 48mm female / 52mm Female. (CON4852)

Ex: 49mm male / 48mm Female. (CON4948)

Ex: 48mm male / 49mm Female. (CON4849) 

Let me know if the combo you need in not here.

This sells for $39 each or 2 for $60

All have a standard - 0.75mm / 34 tpi pitch

These are Custom Camera and telescope filter exchanges.

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)