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Hi Leon,
Like Paul mentions, no need for using Bias frames as you are using ICNR.
Too me it looks like DeepskyStacker is handling the Flat field while Image Pus does not seem to be doing so? as the image stacked in DSS doesn`t show any vignetting even when stretched in Image plus.
No 5 looks about right for your exposure of 2-1/2 min and looks nice and flat.
Do you leave DSS at its default with the final image? or do you adjust the luminosity and color levels? before saving the image?
Also have you tried using a custom white balance with your newly modded camera? Shall save you some processing and give you close to a normal color balance straight out of the camera?
cheers Gary
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