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Camera is a 300D with DSUSB taken in Nebulosity at ASA1600 for 10 mins. No idea about those odd cruciate artifacts. It can't relate to dust on the mirror or CCD because it's a dark. Nor can it be related to the IR mod - same reason. It was using a Canon power supply. I used the same caables (USB DSUSB) to run similar tests on my 1000Ds but they were normal so this is related to the camera itself. It's a horror but is it fixable?
Peter
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