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Old 16-05-2014, 08:29 AM
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rcheshire (Rowland)
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Join Date: Apr 2010
Location: Geelong
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This happens if calibration is faulty. The effect can be masked with dithering, but it's best to have a set of darks matched by temperature and exposure time as close to your lights as well.

If you used bias frames, you could try leaving them out and use your RAW darks only - see how it looks. Flats will need to be calibrated with a bias.
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