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Smaller Riccardi 0.75x Reducer (M63) + 90/600 APO = Full frame?


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Dear Riccardi Users & any knowledgeable Stargazers: the specs of the smaller, M63 Riccardi APO reducer say that it has a 42mm corrected field.

Does it work well with full-frame cameras? I would like to use it on my 90/600 TS photoline APO. The bigger one would be quite tricky to mount:(.


As for camera, 1st round I'd get a sony A7, but later on maybe a large mono CCD/CMOS when they become more affordable.

Edited by GTom
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Takahashi claim that the FSQ 85 with a 44mm corrected circle will cover full frame. It won't. It doesn't even get particularly close to doing so. We have tried two copies of the scope and two cameras here (Kodak full frame CCD) and found the same result. So I very much doubt that 42mm will do it.


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