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[vsnet-chat 6319] Re: [vsnet-obs 45061] CCD observations by Kis (Apr.+)
- Date: Sat, 10 May 2003 01:40:38 -0700 (MST)
- To: skiyota@nias.affrc.go.jp
- From: Brian Skiff <Brian.Skiff@lowell.edu>
- Subject: [vsnet-chat 6319] Re: [vsnet-obs 45061] CCD observations by Kis (Apr.+)
- Cc: vsnet-chat@kusastro.kyoto-u.ac.jp
- Delivered-To: vsnet-chat-archive@ooruri.kusastro.kyoto-u.ac.jp
- Delivered-To: vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp
- Delivered-To: vsnet-chat@kusastro.kyoto-u.ac.jp
- Sender: owner-vsnet-chat@ooruri.kusastro.kyoto-u.ac.jp
Kiyota-san writes:
>> 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.
\Brian
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