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H Alistair,
The subs were in the 2-3 arcsec FWHM range. The seeing was poor the night I took the Ha, guiding graph was showing major corrections.
I might reshoot the Ha when the seeing is a bit better and the object is a bit higher in the sky. I think that much of the variation was due to radiant heat from houses etc here in suburbia. Andy Campbell was out bush the same night and was raving about how good his guiding graphs were on Facebook. So it was most likely a local influence.
I also probably should have shortened the 15 minute subs. I shot some 2 minute RGB subs last night and some of them came in with a FWHM of 1-2, which is the best I can expect from Melbourne.
Cheers
Stuart
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