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Here are two single 20 sec subs of M42 with some stretching and smoothing in PS on the SA . The first with an 800 F8 lense and the second with a 400 F4 lense and DSLR. Both iso400.
It is better if you can mean stack at least ten of these as mean smart object stacked layers aligned in PS or in DSS. So maybe 20sec is better for such a bright object.
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