Celestial hemisphere:  Northern  ·  Constellation: Monoceros (Mon)  ·  Contains:  12 Mon  ·  LBN 943  ·  LBN 948  ·  LBN 949  ·  NGC 2237  ·  NGC 2238  ·  NGC 2239  ·  NGC 2244  ·  NGC 2246  ·  NGC 2252  ·  Rosette A  ·  Rosette B  ·  Rosette Nebula  ·  Sh2-275  ·  The star 12Mon
HELP!!! I can't figure out what this is!!!!!, MICHAEL
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HELP!!! I can't figure out what this is!!!!!

HELP!!! I can't figure out what this is!!!!!, MICHAEL
Powered byPixInsight

HELP!!! I can't figure out what this is!!!!!

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Description

Hello all I need help with a problem I've had. I new to astrophotography and I have this wierd Black mark that is coming in on the upper right corner of my images when I shoot narrowband. It is most present with the O3 filter however it is showing up in H-alpha as well. I am using the new Optolong 3nm that were just released. I am about to return the filters but I don't want to if they aren't the problem.

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HELP!!! I can't figure out what this is!!!!!, MICHAEL