The flange distance is 55mm for T-2 (so any standard T-2-ring will do) or 58mm for the M48-thread.
For a full-frame-camera, we recommend using the M48-thread of the MPCC, the Baader M48 Spacer Ring for MPCC III / Protective EOS T-Ring #2458405 and Baader zero-tolerance protective Canon DSLR T-Ring T-2/M48 and 2" #2958550.
Answer by: Baader Web Team (Admin) on Aug 21, 2019 8:32:00 AM
As a Ritchey-Chretien is similar in design to a Schmidt-Cassegrain, we'd recommend the 2" BDS-SC Baader Diamond Steeltrack® Focuser
# 2957220 for Schidt-Cassegrains with 30mm travel. It has got 2" (50,8mm) and 3,3", UNC threads (the standard SC-threads).
The 2" BDS-RT Baader Diamond Steeltrack Focuser # 2957210 offers 80mm of focus travel and may be used if there is enough place inside of the telescope for the moving inner part of the telescope (if the baffle inside of the telescope isn't too small).
I couldn't information about the connecting thread of the telescope, maybe you'd have to ask someone to make an adapter to SC-thread for you.
Answer by: Baader Web Team (Admin) on Aug 19, 2019 11:57:00 AM
I have a ZWO ASI294MC Pro, which has 6.5mm of back focus, and I want to connect it to my MPCC. In your answer to Keith Krayanek's April 2018 question about a similar camera, you recommended spacers totaling 55mm. But adding 55m to 6.5.mm would equal 61.5mm. Is this number correct? Also, with a M48 mounting surface, do I need a total of 57.5mm of back focus (6.5mm + 51.0mm) or 64mm (6.5mm + 57.5mm)? Thank you.
In the answer to which you refer, we wanted to make clear that if the customer uses the ZWO-T-Aapter which gives a backfocus of 17.5mm, he can use the VariLock variable T-adapter to get a complete distance of 55mm from the T-2-collar.
So, if you have a camera with T-2-thread and 6.5mm of backfocus (with the T-2-thread), you ned an adapter with a length of 48.5mm. This can be done with a combination of Baader T-2 / 15 mm Extension Tube (T-2 part #25A) # 1508154 and Baader VariLock 46, lockable T-2 ExtensionTube 29-46mm (T-2 part #25V) # 2956946, which is set to 33.5mm.
Answer by: Baader Web Team (Admin) on Aug 19, 2019 12:20:00 PM
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