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Hi
As you are just starting out I would suggest that you stick with JPEG for a while, learn how to use your scope and camera gear. The main thing with RAW's is that it preserves the original data from the camera and saves in high bit depth, this in turn allows you to get the most out of your shots. That said, you will need something like ImagesPlus or a similar program to convert and calibrate the shots and turn them into TIF's.
Unfortunately, a lot of beginners want to shoot M42, there is a lot of variation in colour and brightness, that in turn plays havoc with any photo, my suggestion would be to try a number of different length shots, starting from, say 5 seconds up to maybe 60 seconds or more then combine and layer the shots so as to eliminate any burning out of the core, not easy if you have not done it before.
Cheers
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