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hey Blink,
I think the problem is vignetting, what size t-piece for your camera are you using is it 1.25inch or 2inch.It seems that the chip might be covered by either your t-piece or a extender or something, i would be looking at getting 2 inch adapters or t-piece so that the chip of the camera can gather all the light. Also flat fielding corrects for vignetting which is something to look into.
Matt
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