Anyone know any good astrophoto-processing tutorials? For GIMP?
A stack of four 10 minute exposures at iso400 through a 200 mm F5.6 lens. I really need to get a handle on processing these RAW frames for best results...
Autoguiding now seems to work quite well, here's a comparison between 10 min frames with guiding on/off:
More exposure is better, this one has about 40 min in total, previous attempts had only about 12 min and 8 min.
From the same night as my earlier Cygnus photo. This one is not as good with some light pollution or dew-problems at the left. The red artifact in the lower right corner is the same amplifier noise that's visible in the cygnus photo. My home-made lens hood causes vignetting.