I tried searching this and had no luck, but I am sure it’s been discussed before. Feel free to redirect me if you know of a previous discussion.
When DSO imaging with my APS-C Pentax with a Starizona .63x Reducer/Corrector II on a Celestron 8SE SCT, (maybe also without but nobody got time for f/10), I always get a red center to green outer gradient, and I think this is normal.
I have figured some tricks to remove this from images of galaxies, (small objects against a big flat background) in Photoshop, but I am wondering if anyone has any advice for things like nebulae that take up the whole field? So far my experience with gradient remover actions in Photoshop have just produced mostly colorless images.
If anyone has any advice on equipment set up that might address or minimize that, I’d welcome that also.
Edited by AnthonyQ, 15 August 2020 - 05:15 PM.