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Many thanks. I wasnt sure what to expect, thankfully there was a few bright stas I could see in the viewfinder to show I was on target. A 20 second test image to check focus just revealed it when the laptop bright ness was turned up, so I knew it was dooable. A darker free of moonlit sky might show it better, but at the same time the seeing here was above average when i took the image run.
It looks definately like an oxygen line emitter, very little HA in it, mainly blue. That probably explains why it can be seen visually in a suitable scope. Dont think my 10 would be big enough though!
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