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Troy
I had issues with my SBIG ST8300 - unless my flats were longer than 1 second, I had shutter artifact which screwed with my flats.
I don't have that issue with the QSI - that said, as a matter of course I use some plain white cotton (about 4 layers of it) between the OTA and diffuser to step down the brightness. I aim for exposures of 2-3 seconds.
Pete
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