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Yes I found the same green cast with short exposures on my alt-az as well. Not sure what it is but it’s 100% better with longer exposures as you have noted.
Yes I use an l-extreme for eaa. It’s brilliant - absolutely brilliant!! Just pick your targets carefully as it doesn’t give nice star colours and cuts out reflection nebula. It’s great for shooting into the city light glow or during full moon. You do need to increase sub lengths by about 2x tho. Flats as highly recommended otherwise you can get some crazy effects over the field
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