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Hi all, I'm experiencing a strange imaging issue with my ZWO ASI 120MM-S. There's a wedge shaped shadow in all bright stars. I think I can exclude my telescope (8" F/4 Newtonian) as my DSLR does not exhibit the same behavior. Here's a crop from a representative sample:  Does anybody here have a clue as to what could cause this? Thanks in advance for your help! Cheers, Georg |
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It turns out, that this is not a problem of my camera. I tried a different camera today and got a very similar result. So it's obviously my OTA. I have no idea what could cause this kind of problem, though. The collimation seems ok and there's nothing (like e. g. the focuser) that I can see which would cause this. Mirrors are reasonably clear, as well. Again, any ideas are very welcome. |
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Hi, nothing in the optical path, like drawtube?? I had a similar problem in the past. Jean-Christophe |
