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welcome to the boards Michael and a nice start! a couple of pointers to help you out. the tracking is not too bad, the reason why you have some elongated stars at the edge is mainly a coma issue and perhaps the collimation is a little out. you can get a coma corrector to solve this, new ones can be expensive, second hand ones come up from time to time. also you will find that if you take some flat field images and use Deep sky stacker to combine them then you will get rid of a lot of the vignetting you can see in the image. last thing to try out is the colour balance. in photoshop you can click on the grey eye dropper and select a part of the sky that should be star and nebula free, this will adjust the colours so they are more balanced. this game is one of learning and improving, keep at it!
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