On Thu, 28 Feb 2008 11:06:05 -0600, <jjs> wrote:
> "Matthew Winn" <*@[EMAIL PROTECTED]
> wrote in message
> news:dhkbs3945o8oke2g6qrgr90ukcfnaal49c@[EMAIL PROTECTED]
>
> > The Compur-Rapid does have flash sync, or at least every Compur-Rapid
> > I've seen does. It's X sync, firing when the shutter is fully open.
> > The Synchro-Compur shutter adds M sync for flash bulbs.
>
> Interesting. My Compur-Rapid has no flash socket whatsoever. It is
#40642xx.
> Where the ebay one has a flash socket, I have a cable release socket.
Now I look more carefully I find I have one like that too. It's not in
a camera, which is probably why I didn't notice it.
> Were X (electronic) flashes available back then?
I'm no expert on flash sync, but I get the impression that X sync was
used with bulbs first: not because it was best suited to bulbs, but
because it was easy to build. All you need to do to get X sync on a
Compur shutter is to put a switch next to the ring that operates the
shutter blades and attach a peg to the ring such that when the shutter
is fully open the peg closes the switch. M sync is harder because the
switch has to close well before the shutter blades start to open.
I have a manual for a 35mm camera with a Compur-Rapid shutter and it
mentions electronic flash only in passing. Mostly it talks about bulbs
and the need for a shutter speed slower than 1/25s to allow the light
to peak.
--
Matthew Winn
[If replying by mail remove the "r" from "urk"]
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