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OK, here's some more data to put up for the group to interpret.
Attached are some CCD Inspector curvature maps - 1 & 2 are taken with the CCD, the 3 & 4 with the DSLR - all of these shots are taken with the reducer. 5 is taken with the CCD, but no reducer.
As the tilt is evident for both devices, I think that rules out sensor misalignment.
I have oriented both cameras with (roughly) the same degree of rotation.
The tilt is reasonably constant (excepting image 5 which is taken through a different optical system without the reducer, and the camera was attached via a 2 inch nosepiece, rather than screw in adapters). As the CCD & DSLR are vastly different in weight - does this suggest that slop in the focuser is unlikely?
Of course the weather won't oblige to let me do the tests you suggested under the stars for a few nights yet!
Ta again,
DT
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