[vsnet-chat 1723] Re: BVRI Photometry

[bas@lowell.Lowell.Edu (Brian Skiff)]

     Shutter-timing errors at short exposures can lead to the problems you
see, almost certainly for exposures less than 3-4 seconds.  Another thing
that might be overlooked is scintillation noise with small apertures.  Even
if you're getting enough photons such that the formal photon-statistical
noise is small, the jitter casued by seeing with small apertures won't have
been averaged out.  A good place for some background on this is Young et al.
1991 PASP 103, 221.

\Brian

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