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From what I see the high contrast area on the camera is affected by a purple fringing like there is a different lens in play, as I'm sure the lens is the same one solution about the problem is the IQ380 don't have micro lenses ... but IQ3100 maybe it have ...I don't know what the purple glow is, but as it's in direct connection to a bright edge on that CCTV I'm thinking that it's some sort of internal reflection, could it be a reflection in the sensor glass or something? Just speculating. If it would have been normal CA of the lens I would have expected it to show more on other edges too, and of course be seen on the IQ380...
the noise perf. from what I see is in favor of the IQ250.. also there are some color completely different from CMOS to CCD ,, some wall in CCD are greenish,, the CMOS's are yellowish... but maybe there is some difference in white balance point, if not, think about making a good color profile of both camera... the result to me are very strange.
Best regards, Domenico.