Hi
have been experimenting with an asi1600 CMOS camera to see what goes in narrowband. On my system it is Ha sky-limited at less than 5 minutes when the moon is up, but under dark sky, quite a bit longer subs make sense - at gain 200 it is sky-limited at about 10 minutes.
http://www.astrobin.com/full/268410/0/
Had about 7.5 hours of 10 minute subs taken at different gains and decided to put them all together to see what could be extracted from the data without excessive processing - light deconvolution and a stretch plus a little noise reduction. I have some O3 data taken with a H694 camera and may try combining that with the Ha data at some stage, but for now, this is the best I have - am particularly pleased to have some detail in the cometary knots.
thanks for looking. regards Ray
edit: for interest, here is the extremity region, software binned 2x2
http://www.astrobin.com/full/268411/0/?nc=Shiraz