PNS MANUAL: Taking Twilight Exposures
Twilight sky exposures are best taken as if they were science exposures, i.e. controlling the exposure duration with the shutter even though it is a little slow. The alternative, of leaving the shutter open and reading out the CCD introduces far greater nonuniformities as the readout takes longer than the shutter motions.
So twilight sky exposures should be taken in the same manner as regular science exposures.
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Last updated 19-07-2001
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