Description

2" Adapter for 9.25" SCTs and under, with Brass Locking Ring (ADASCT)

This visual back fits rear cells that have a 2" opening with a 24 TPI (threads per inch) male thread. It can be used with the 8", 9.25" (except the 9.25" Celestron EdgeHD) or other SCT with the standard SCT rear cell. It can also be used with the Maksutov-Cassegrain scopes from Telescope Engineering Company (TEC) that have this specification.

This visual back allows you to use 2" accessories that slip in, i.e. 2" diagonals, Barlows, 2" eyepieces or CCD camera. Starting in late August 2009, we added a third thumbscrew to the two existing thumbscrews and brass locking ring to securely hold your expensive accessories with ease. Also fits DayStar T-Scanner cover that has male T-thread.

This adapter has a net spacing distance of 2.1" (53.3 mm).

2" Adapter with Brass Locking Ring and 3 Large Thumbscrews - for larger SCTs with 3.25" Rear Cell, (ADASCTLC and ADASCTLM)

This 2" visual back threads onto the rear cell of 10" to 14" SCTs with 3.25" male threads on the telescope's rear cell. It provides a full 2" unobstructed opening (unlike most visual backs). Use with 2" accessories that slip in, i.e. 2" diagonal, Barlow, 2" eyepiece or binocular viewer. It features our unique brass locking ring design and 3 large thumbscrews to hold your accessories securely and squarely; ideal for critical applications. If you prefer to use just one thumbscrew on occasion (perhaps if you are interchanging accessories frequently), simply remove the extra 2 thumbscrews for that session.

We offer two models with slightly different thread specifications. Please verify that your instrument has a 3.25" male thread on the rear cell before ordering. This adapter does NOT fit the 16" or 20" Meade telescopes with 4" rear cells.

Note: Celestron Edge HD scopes have a restricted rear cell that may not allow accessories with a long nosepiece to fully seat in this adapter (the AP Maxbright diagonal will not seat). It is recommended to choose the ADASCTLC27 and ADA2003 (or ADA20132) as an alternative when using the Edge HD scopes.

ADASCTLC - for 11 and 14" Celestron SCTs
ADASCTLM - for 10", 12" & 14" Meade SCTs. Adapter cannot be used when the Microfocuser is attached to the LX200GPS.

This adapter has a net spacing distance of 1.5" (38.1 mm).
It has a safe nosepiece insertion depth of 1.1" (27.9 mm).

2.7" Adapter Threads onto larger Meade SCT’s with 3.25" Rear Cell - Allows the Use of AP 2.7" Accessories (ADASCTLM27)

This 2.7" threaded back allows the use of Astro-Physics 2.7" accessories with 10", 12" & 14" Meade SCT’s. The accessory back was designed primarily to accept the popular 0.75x, 2.7" Photo-Visual Telecompressor (27TVPH), but it will also work well with other accessories. Combine it with our 2" adapter (ADA2003) or our thin 2" adapter (ADA20132) and you have an unobstructed 2" visual back. Screw in our ADA204 2.7" to 2" SCT Adapter and you are right back to the standard Meade 2" visual back. Attach our 2.7" to 6x7 Outer Bayonet Adapter (ADA2767) along with either of the STL Adapters for the 6x7 Outer Bayonet (ADA671 & ADA672), and you have the maximum available light path to your STL Series camera, and easy image framing to boot! Virtually any accessory from 2.7" diameter on down in size can be used with this adapter, greatly increasing the versatility of your large Meade SCT.

Please verify that your instrument has a 3.25" male thread on the rear cell before ordering. This adapter does NOT fit the 16" or 20" Meade telescopes with 4" rear cells. The adapter is one-piece, machined aluminum and is anodized black.

2.7" Adapter Threads onto larger Celestron SCT’s with 3.25" Rear Cell - Allows the Use of AP 2.7" Accessories (ADASCTLC27)

This 2.7" threaded back allows the use of Astro-Physics 2.7" accessories with 11" & 14" Celestron SCT’s and EdgeHD's and the Celestron 9.25 EdgeHD. The accessory back was designed primarily to accept the popular 0.75x, 2.7" Photo-Visual Telecompressor (27TVPH), but it will also work well with other accessories. Combine it with our 2" adapter (ADA2003) or our thin 2" adapter (ADA20132) and you have an unobstructed 2" visual back. Screw in our ADA204 2.7" to 2" SCT Adapter and you are right back to the standard Celestron 2" visual back. Attach our 2.7" to 6x7 Outer Bayonet Adapter (ADA2767) along with either of the STL Adapters for the 6x7 Outer Bayonet (ADA671 & ADA672), and you have the maximum available light path to your STL Series camera, and easy image framing to boot! Virtually any accessory from 2.7" diameter on down in size can be used with this adapter, greatly increasing the versatility of your large Celestron SCT.

Please verify that your instrument has a 3.25" male thread on the rear cell before ordering. The adapter is one-piece, machined aluminum and is anodized black.

Note: Celestron uses a 3.29" x 16 thread.

This adapter has a length of 2.5" (63.5 mm). To derive the net spacing distance when using an SCT, subtract your male thread depth from the back of your SCT.