Quote:
Originally Posted by multiweb
It looked like focus to me in the highres but then again it could be the LUM/Ha blend as stars are always a bit bloated in RGB and tighter in Ha. You focus with a bahtinov mask?
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I have a ZWO EAF, but I haven't managed to get the autofocus routines to work properly in SGP just yet (lack of clear nights to just fiddle). High on the priority list of things to do.
I found the best focus by eye, then did shots to measure FWHM and see how good I could get it either side of focus. But that was just a one off, and I wasn't refocussing over and over, nor adjusting on a per filter basis. I think the ZWO filters are pretty par-focal as far as I can tell.
I've attached the processed stacks of Ha and Red (pre colour merging them) from the top right corner. I don't know if the "bloat" in the Red is just the way it is, but the Ha is pretty good.
I qualify that by knowing that this is the corner of the frame too, and the reducer needs some tweaking.
Thoughts?