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This irregular galaxy does have a low surface brightness so you’ve chosen a difficult target! However, you have captured it vey well, especially for 2 min subs with a DSLR. I also get black pixels with my SBIG ST7, even though it is temperature regulated. In CCDSoft (camera control software for the ST7) there is a “Remove cold pixels” function which can be set to Weak, Medium or Strong and this usually gets rid of these pesky critters.
Cheers
Dennis
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