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Darks and Dark Flats

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smithn00
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Darks and Dark Flats

What is the difference between a DarkFrame and a Flat Dark?

HQA
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flat-darks

A "flat dark" is a dark frame that has the same exposure time and temperature as the flat-field image.  Often flats are taken at much shorter exposure times than your science frames, and so you might use special dark frames for subtraction.  A regular "dark frame" just matches the science frame - it may be a stack of darks with the same exposure time, or it may be a longer exposure stack that is scaled to match the exposure time of the science images.

Arne

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