fredvanner
Well-known member
We are all familiar with the radial diffraction spikes from mirror supports. I have seen previous posts about radial diffraction patterns from refractors caused by lens pinching or intrusion of lens supports into the aperture. I am observing radial diffraction patterns that do not seem to fit this model - they are more or less uniformly distributed around the star. Does anyone have any suggestion regarding the possible cause? (Actually, I quite like the effect, but I'd like to understand it).
As an example, I attach a recent image of NGC7000 taken with my S/W Esprit 80 APO and ASI2600C camera (60 x 120s; ÷4 downsample). I also attach full resolution previews of the region round xi Cyg, in the final image and in a single frame.
As an example, I attach a recent image of NGC7000 taken with my S/W Esprit 80 APO and ASI2600C camera (60 x 120s; ÷4 downsample). I also attach full resolution previews of the region round xi Cyg, in the final image and in a single frame.