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The more glass you have in your imaging train the more likely you are to get internal reflections. Especially if you use an LPS filter with a DSLR.
Light pollution shows up quickly with a DSLR but not a cooled CCD which is my recommendation.
Alnitak will show up every reflection in your system in spades.
Ive attached a recent image taken with a refractor, cooled CCD + FR, 5KM from BrisVegas and with heavy light pollution using 10 min subs. So it can be done its a matter of learning how each piece of your system works under certain conditions.
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