Quote:
Originally Posted by multiweb
This is Sii only widish fov. There's not as much as Ha, still a fair bit though but Oiii would be stronger than Sii in the center IMHO.
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Yep, Oiii definitely stronger across the centre regions, but when I processed the Sii and Oiii bicolour pixinsight said Sii was brighter, so I registered and linear fit against that one.
I might be able to gather Ha soon, and see what sort of exposure time is needed. I suspect it will be longer than the 4 minutes I've seen people use on astrobin at the same gain and focal ratio. Unless they've entered some specs incorrectly.
I've uploaded the SOO bicolour and the Sii stack here. Pretty pleased with the SNR in these. 15 minute subs have their advantages I suppose. Wind gusts kept my guiding around 1.5 arc second RMS so whilst the stars were round, I needed to do a bit of sharpening.