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I use a 5dmkii unmodded, 2x power mate on a 102 f7 refractor and the cls 2" filter. The cls clip does give you an extended blue channel but if you set dss to align the rgb channels and set the black point to 0 after it stacks it's a non issue.
I live in the inner west 9 km from syd cbd so my sky glow is significant. The longest subs I can do is about 10 min but only past zenith facing west otherwise I stick to 5 min subs.
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