Quote:
Originally Posted by bojan
To shim the camera flange is possible... will have a look.
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It would be good as a "quick" reversible test or even possible fix
Quote:
Originally Posted by bojan
I would like to avoid doing those things on the scope and in the dark... and I can't see anything suitable further away than 10 metres from where my pier is mounted...
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Bojan, I'm not quite sure what you mean I wasn't referring to any outdoor tests, but possibly inside on a bench.
One thing is for sure, you need to fix it in the way you described initially- fix/adjust the camera, then fix/adjust lens separetly, BUT before ANY of that I would test the situation with different lenses to see if the issue is still present.
You mentioned your 400mm 2.8 was an FD modified to EOS mount. In modifying an FD lens to an EOS mount isn't there a lens mount flange to focal plane difference that needs to be accommodated in the modification - 1.5-2 mm or something? If that isn't perfect perhaps that causes a slight difference in the corner focus vs centre focus due to the flat film plane vs spherical surface (however slight) of the light wave, causing problems with infinity focus. Maybe that 1.5mm-2mm difference should be checked or what's the word from Bridge, ....finessed?
Best
JA