Camera shutters

[Harrison, David]

Posted to CCD-world:
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I was faced with this about 14 years ago when I needed an 80 mm opening.  I
had to design and build a multi-blade shutter similar to a Copal camera
shutter.  Mine was slow, about 0.5 seconds, but was used mostly for getting
a good black reference in a system with seconds of integration time.  We
built it with three thin steel blades that overlapped for good light
blockage and short optical axis dimension; we had an interfering corrector
lens near the camera window.  Its main problem was that the frames exposed
during shutter operation had more integration time in the center than at the
edges, although this was not critical for us, as we threw those away.

If you have decent mechanical engineering backup, show him/her a viewcamera
shutter and explain how you want it to be made in a larger size.  If you are
your own backup, look at one yourself and start thinking.  They only seem
complicated at first blush, then they look impossible, but gradually it will
make sense.

Dave Harrison

> ----------
> From: 	Roy Tucker
> Reply To: 	CCD-world at cfht.hawaii.edu
> Sent: 	Wednesday, March 11, 1998 1:38 PM
> To: 	CCD-world at cfht.hawaii.edu
> Subject: 	Camera shutters
> 
> Posted to CCD-world:
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> Dear Fellow Photon Foragers,
>      I've been using the usual Uniblitz shutters for smaller imagers up to
> the SITe TK1024. Their selection on shutters has a maximum aperture of 45
> millimeters. Can anyone suggest a manufacturer of larger shutters or
> indicate what they use for shuttering large arrays? Thanks.
> 						- Roy Tucker
> 
> 
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