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lights = a normal exposure
darks = an exposure with the same settings as your lights but with the scope/lens cover on so basically all you are recording is the noise generated by the sensor without any light hitting the chip.
flats = exposing to an evenly illuminated light source across the entire telescope aperture to around 30% of your maximum pixel value (records dust/vignetting)
flat darks = if the exposure needed for flats is long enough you will need to take dark frames to be applied to them.
meaning of life, the answer is 42 (apparently)
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