I came across a meade 90mm Mak from the 1980s which takes .965" EPs. It also comes with a rather long T-adapter as well. I got a bit of history about this particular scope from the Cats&Casses forum but in terms of photography, the .965" tube would cause a lot of vignetting on film, right? One person who responded to my post said that a long T-adapter (moving the focal plane back farther) would reduce vignetting, but what I want to know is will there always be vignetting using this setup for taking pictures?
That depends on the image circle at the focal plane. If the t-adapter is a 2" tube, then the image circle may be large enough. Why don't you contact Meade and ask them.
Interesting little Mak there. If it uses standard threads you may actually be able to replace the eyepiece holder with a 1.25" EP holder. There are lots of adapters made for using Cat accessories with ETX Maks like the
Meade Back Cell Adapter, ETX to SCT Accessory Adapter.
Anyways, I have a new C90. The standard Celestron T-adapter is short and narrow and causes lots of vignetting on a standard 35mm camera. I ended up replacing the Celestron T-adapter with a wider and 2X longer Orion tele-extender which fixed that nicely. If this Mak you're looking at uses standard backcell threads, you may be able to use a variable tele-extender to adjust the distance to your liking instead of using the fixed-length T-adapter.
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