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Cleared late, luckily! Here's my spectrum from tonight, SA100 grating with Canon 650D & 200mm lens on Vixen Polarie, 20 x 15 sec at ISO 6400, F/5.6. Very strong and gusty wind affected all subs.
Hydrogen lines growing stronger but still can't get much at the H-gamma line - pretty much at the edge of the camera response, maybe to do with altitude as I picked it up the one time I did an early morning session on it, when it was considerably higher.
Cheers -
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