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With my DSLR, I rarely used flats, except where there was likely to be a lot of vignetting...dust motes rarely seemed to be a problem. With the QHY8, dust motes show up much more regularly. A home made light box with an inline dimmer switch purchased off ebay works best for me. I take the flats directly after imaging by putting the light box on top of the scope and adjusting the dimmer to 1/3. Usually take exposures of 2-3s for a background value of 9000.
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