I have a Canon EOS Ra with a pixel size of 5.36 microns. I am looking to get a refractor for larger targets. I use this tool https://astronomy.to...ccd_suitability to figure out which glass is best for my camera and typical seeing conditions, which are my bortle 7-8 backyard. I saw a scope that has a 559mm focal length that I am interested in. According to the tool, it will have some undersampling under good seeing conditions. I've read that undersampling leads to pixelated stars and overall lower res images, which can be dealt with using drizzle. But the thing is I took a pic of Andromeda using a 60mm guide scope with a focal length of 240mm and didn't notice any pixelated stars, not the best quality of course, since it is a guide scope. Take a look at the image below. I had to squash it so it would fall within the upload guidelines. So my question is: How much undersampling is too much undersampling? The scope I am looking at is the Zenithstar 81 APO. The field of view is what I am looking for.
Edited by gfunkernaught, 04 March 2021 - 05:36 PM.