I've been working on imaging Pleiades the last few nights. This originally just started out as a test for the impact of FPN (which ended up being a flop...I had a nice detailed thread about it, which I lost...then PI crashed, taking all my test data with it. MEH.) I decided to acquire a bit of RGB data (and, a tiny, tiny bit it was! Only about 25 minutes per channel @ Gain 0 seemed to be enough!), and combine it with the total of 1120x10s subs I acquired for the test. The luminance data actually turned out quite nice...and overall the image isn't too bad (although it is nowhere near as deep and detailed in the faint areas as I am used to getting at my dark site):
Ironic. I always start with Pleiades. ;P This was my first DSO that I imaged on my regular old photography tripod way back in early 2013, then again with my Atlas in 2014, and here I am again, first full LRGB image with the ASI1600 in 2016.
Anyway. The real issue is the bigger stars...and their halos. I am wondering if I've finally discovered a microlens diffraction issue with the ASI1600? Or could this be caused by something else?
It isn't as bad as many issues I've seen...however it is a bit unsightly with the purple and green in there. It does only seem to occur on the brightest of the bright stars...and Pleiades is kind of an exception in that regard. Still...I'm wondering if I just have to live with this...or whether there might be some cause that I may have control over. Thanks for any insights!