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I think I’ve stumbled across the problem with checkered pattern in my images
Here’s an image of my flats with histogram adjusted to expose my issue
I’ve been using an old white t shirt stretched over my Newt and a Huion dimmable light panel for years with my 2600MC , no issue at all
Unfortunately the 2600MM is so damn sensitive it’s picked up the pattern of the t shirt in the image from calibration
The issue doesn’t present itself until you stack loads of data with calibration frames ( flats and bias ) I tried stacking just 20 or 30 subs with 10 flats and 10 bias , then an auto stretch and you can just see a very faint pattern
The problem exacerbates when you stack multiple nights of the same filter too
I tried no calibration frames and the background was clean as whistle ( apart from Vignetting)
Any ideas as a substitute for the white t shirt ?? maybe just use the light pad with a opaque piece of plastic ??
Martin
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