My guess is most are OM-1s. (Favored by many for astronomy because of
the mirror lockup.) Mirror lockup would be the culprit. Photographer
gets the camera set, locks up the mirror in anticipation of the shot,
and then waits (while the sun burns a hole in the shutter) for the
'decisive' moment.
Jim Couch
Walt Wayman wrote:
>
> I wondered myself. When the shutter curtains are closed, the
> mirror is down. When the mirror is up, the curtains are either
> moving or open. How could this happen? I pondered. (I try to
> ponder a couple of times a day.)
>
> Then a feeble spark ignited, producing this notion: using the self
> timer could do it. The mirror is up and the curtains are closed.
> It's only a few seconds, but if you've focused on the sun, it
> could happen. Or not. I really don't know. I'll yield to Clint
> on how it happens.
>
> Walt
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