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I'm a newbie to mono imaging and am having trouble with circular/ring shapes in my subs. The circles are particularly pronounced after stacking my Lum subs but also appear in blue stacks. At the moment, this is making my lum subs unusable and I'm only just managing to put together RGB images.
I'm using an ZWO ASI1600mm with ZWO filter wheel and filters (36mm unmounted).
The attached TIF (LumStack.TIF) is 10x150sec of Lum subs stacked in DSS. The circles aren't very pronounced at this stage but after DBE and STF (see second SunflowerLum.jpg) the circles are very clear to see.
I've also attached a stack of Lum data on Bode's galaxy which shows the same issue.
Does anyone have any ideas what could be causing these?
Thanks in advance
First view of the Sun for almost a month, but the wait was worth it. The large sunspot has split into 2 umbra, both within the same penumbra. Plage and filament activity nearby. There is a large prominence just above this on the oncoming limb and 3 other prominences on this limb. On the Western limb there is another even larger prominence. I will set up for WL and have a close look at the AR. Hope your skies are as clear as mine.