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Well they may actually be equally green. Eta Car and the Tarantula both have different stretches applied. As said it's just an autostretch and both targets have a different brightness.
Single frame Eta Car attached. Not as bad as yours. I wonder if this could just be unfortunate light pollution. I noticed my image autostretched doesn't appear to have as much contrast as yours, and eta car is close to the city centre from my perspective (not to mention it's full moon in a few days).
Sorry to bombard you with questions but how do you capture your images? Ezcap or nebulosity?
My results were 180 seconds with gain 17 and offset 123. I did my bias and dark frames with the same gain and offset settings and with the cooler temp set at -15degC. 10 bias (just zero second shots) and 20 dark frames.
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