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I agree with Patrick, 1535 and 2392 are great.
2371 is difficult for me.
I usually observe PN with a 12" Dob at 320 times without a filter.
With the Helix and Dumbbell I use 115x and a UHC filter.
The attached file is 70 PN sorted by surface brightness.
It is the same 70 PN as in the other lists
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