Originally posted by pixelsaurus How much field coverage do you get before coma becomes objectionable? I'm just curious as I suspect the field of good definition on a f/3.9 system would be pretty tight.
Sorry Pixelsaurus, I didn't see your post till just now. It is fair tight as you say, it is pretty minor for a bit and the obviously at the corners its pretty extreme. I Have the Baader Coma corrector on back order and I've been told the new one has been made avail over seas, just waiting on it's availability in Canada.
Just as a added note, I printed off my M31 picture in a couple sizes from 4x6, to 8x12, and it looks pretty good actually. 4x6 isn't noticable, and if you look closly at the 8x12 you can notice it elongating at the corners. unless you know what your looking for you wouldn't notice any arrow head stars unless you specifically were looking for it. I imagine any bigger, especially near poster size it would be in your face.
Last edited by Dr_who; 10-25-2012 at 08:12 AM.