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Hi Martin,
What were your NB filter bandwidths, 6/7 nm or 3nm? I live in a similar city area in Sydney under 7 or 8 bortle scale near Macquare uni. I imaged Helix a couple of times before, with 12nm and 6nm using a Canon 400/f2.8 and Skywatcher Quattro 10 with ASI1600. Regardless how many hours I did (over 50), outer edges near side of the galaxy-like structure wouldn't show up. Last week though, with 3nm filters and quattro 12/ASI2600mm these area would be visible in a couple of hours. I'm having problem with my CEM60 after changing to a pier tripod at the moment with ultra low DEC guiding errors but much higher in RA. I was hoping to find the cause and post an image.
Cheers,
John
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