Quote:
Originally Posted by pkinchington
Hi Marc, I just used one star alignment so the constellation was on the edge of my full frame image. I think that may have caused the issues on the rhs. I don't know what was causing the diffraction as I used my lens fully open at f2.8.
Cheers Peter (Kanga)
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ha ok it makes sense now. You should stop your lens maybe 2 stops down. If it's a heavy lens you might consider bracing/holding it with centering rings in front of your camera so it doesn't sag and stays square to the camera sensor. Try that first and see if it improves your field. Maybe the stars diffraction spikes will get better too with a few stops down.