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Hi Trevor,
Beautiful star colours. The gray centers to the brighter stars means they’ve been white clipped. This can happen when you stretch the image beyond the dynamic range and then try to pull back on the highlights. The image is also a bit noisy. This can be either stretching feint data too far or that your signal to noise ratio is too low. More subs will help with this or a cooler sensor. As the others have said, you haven’t provided enough information to really pin point where the improvements can be made.
Cheers
Ryan
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