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Hi Carl.
I will be brief.
Lights= your exposures of the target you are imaging
Darks= Same length exposure as your lights but with the cap on
Bias= is the shortest possible exposure you can take with the cap on probably 1/4000-1/8000 of a sec
Flats= are the hardest technicaly where you take an image of all your inperections of the scope...this needs to be gone throw in depth and there is many methods to do so..it is also the most important part of calibration followed closely by Darks then Bias.
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