Well, that's only a 15 sec shot....you wouldn't expect too much to show of the neb. Maybe push it to 60 secs and some neb will begin to come out. Remember, it's a large neb, about 130ly across and is more than twice the size of the full moon as seen from Earth (it's nearly three times the size). It's integrated apparent brightness is mag 9, so although it looks bright in piccies, in real terms for a very short sub it won't be so bright.
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