Quote:
Originally Posted by The_bluester
Do you mean a square'ish halo not quite centered? The 294 is more or less known for that but I Have found that with lots of subs you need to stretch the data pretty hard to see it.
Are you using flat frames? That should sort vignetting, but on the 294 the flats need to be taken at an exposure time of around 5 seconds or more of they will cause problems.
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Didn't know that about the flats, i'll try it next time I get out. I've been doing <1 sec exposures.
There is a big round glow that takes up about 1/3 of the image in the bottom right corner. It's not an issue when I only do minor stretching but it quickly gets out of hand when I try to bring out detail.