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Having just had a 1st poke at M42 myself, it bought home the reality that one MUST get the hang of layer masks in PS (with varing exposure times in this case), once you get over that hurdle, its a doddle, and they are sooo usefull for selective sharpening etc too, lots of things.
Without learning this, the astroimaging experience will eventually hit a brick wall, its an essential skill.
And, PS is a must have, simple as that.
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