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Allan, that is certainly an interesting idea. I can think of 2 issues straight away.
1. When the shutter normally closes the image downloads. So, to use the camera shutter one would need to do a modification of the camera electronics. Probably the easiest way would be to have a separate shutter somewhere in the image train.
2. The total light time would vary, though perhaps only by a matter of seconds. I guess darks/flats would work OK, but the signal would vary...perhaps like thin clouds reduce values in some subs.
Peter
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