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I’m using 160 gain. I take flats 0.78 to 0.98 sec exposures depending on what the flats calibration wizard in sgp tells me. Usually I use a white T-shirt with a white iPad screen behind it.
To be honest the artifacts and motes are usually not so much of a problem. When I do the flats right all that stuff comes out as far as I can tell (see my other post just above this one on horsehead). It’s the noise and general graininess of the image that’s got me stumped.
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