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Thanks Pat.
I am only about 4km from CBD, as the crow flies, very light polluted skies. The CLS filter helps reduce the light pollution but I never compared imaging with or without it. It is hard to find time do that considering how cloudy this year has been.
M20 is quite bright and imaging from my backyard works but I tried imaging some fainter galaxies (with my ED80) and even with 4h integration time they look like fuzzy blobs. I will need to find a place with much darker skies once I finish all the modifications I am working on ATM.
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