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Re: [vsnet-obs 45064] Re: CCD observations by Kis (Apr.+) >>> So, I take 50 or more images of very very short exposure (0.01 sec.).... > > Is there really a photometrically-reliable shutter that will work > at this exposure? I bet not! Probably the minimum exposure where the > finite shutter time will not be a significant fraction of of the exposure > itself is perhaps 4-5 sec. This is something you can test, of course, > using a suitable star to see how the instrumental magnitude changes as > one goes to progressively shorter exposures. Kiyota-san possibly used the same exposure time for both bright stars and faint stars, and did not use different exposures between them. If this is the case, he was probably testing the linearity of the CCD. Regards, Taichi Kato
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