Quote:
Originally Posted by tlgerdes
1) Your method appears resonably sound, convoluted, but sound.
2) Why do you want 7 min exposure of the galaxy for widefield. You would be better off at 800ISO and 2mins.
Oval stars could also be lens aborations.
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The 7 minute exposure is more just for alignment/tracking purposes. Once i am satisfied with the stars overlapping in forwards and reverse, i will usually image for a much lower period of time (30 to 240 seconds, ISO 1600 to 400)
The long exposures are purely to get the mount aligned as accurately as possible - Any errors are amplified once i point the scope away from the pole - or it may just be slop in the mount throwing mount out of alignment slightly once the weight shifts.
If course, i'm looking at stars in a 10MP image at 100% - if the image is scaled down, the oval stars become much less noticeable.
Theres a selection of images i have taken here (Yes, slow site)
http://220.233.71.133/Astro/