Could the corners also be causing the small diffraction spikes I saw around Iota Orionis?
Yes, for sure. Anything that disturbs the light path (cuts into the light path) will cause a diffraction spike.
Sent: Wed, Apr 7, 2021 3:13 am
Subject: Re: [ap-ug] First light to me AP130 EDF 6. One optical question about optical vignetting / field illumination
Thanks for the insight -- that clarifies that it must be the effect of the camera adapter then. Could the corners also be causing the small diffraction spikes I saw around Iota Orionis?