Well it seems to work reasonably well. There is some vignetting for a full frame sensor however I think this has more to do with the camera connection than the secondary mirror.
M48 connection is not ideal in my opinion. There is an M54 connection to the three inch corrector that would be more suitable however all dslr t rings that I am aware of are M42 or M48.
I have noticed that many full frame cameras such as the ASI6200 come with an M54 connection.
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