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Hi Raymo,
Looks ok for 55secs. Take some more subs and stack them all together. The more the better.
Darks and bias frames are very easy to take. Just put the lense cap on the camera or ota and take images. For darks use the same duration and iso settings as your light frames and bias frames you use the shortest exp time you can. Flats frames are a little more complicated and requires a uniform light source such as the sky at dawn or dusk or a light box/panel. Then its just a matter of playing with exp time to get an image with about 30,000 adu's.
Then just add them all into your stacking program.
Cheers
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