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There are some disadvantages for replacing the secondary with a camera
(thinking of a newt here)
Hiding the cables to the camera,
Extra weight of a coma corrector and spacer installed would mean a stronger spider needed,
Coming up with a method for adjusting the tilt and collimation of the camera,
Coming up with a focusing method
Locked into OSC (you could swap one filter at a time with a mono, but then run the risk of dropping a filter onto the primary, in the dark)
No OAG, which means a guide scope for guiding and probable flexure issues
Personally I think you back yourself into a corner doing this method (converting a newt).
Bill
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