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I had a Takahashi FS152 scope with a 2.7 inch focuser.
When I went to a full frame sized Astro camera (SBIG STL11) I found it would vignette terribly. Also with the 2.7 inch reducers.
I went to 4 inch and it was fine. My TEC180 had a 3.5 inch focuser and that was fine even with a 16803 sensor which is larger than full frame.
I am not sure what size is the minimum for full frame but estimate it could be 3 inches.
Greg.
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