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Mark,
If this is a single sub then I’d say it’s light getting in from somewhere.
I’ve seen it before in subs I’ve taken in my obs. In my case the mere fact that my computer screen emits enough light for the scope to pick it up. I must remember to draw the curtain and cover the screen completely with a shield to prevent this or simply turn off my computer screen completely.
The other time I’ve seen it is when I stack and reduce in startools using the gradient removal module- I must admit it comes down to the flats you use too.
Other than that I’m sure if you eliminate any ambient light nearby the scope it should remedy itself.
My two cents
Anthony
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