Re: [photo-3d] Synchronize Olympus OM-10's

["John A. Rupkalvis" <stereoscope@xxxxxxxxxxxxx>]

----- Original Message -----
From: <pzuijlekom@xxxxxxxxxxxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Saturday, March 31, 2001 2:23 PM
Subject: [photo-3d] Synchronize Olympus OM-10's


> I've two Olympus OM-10's on a bar with a dual cable release.
> I'm not happy with this setup. I've one Winder. To be able to
> fire the two cameras in sync, I think I can do two things :
>
> 1) Buy a second winder and fire both cameras with a Y-cable.
> 2) Use the two contacts in the bottom of the cameras.
>
> Does anybody know the 'pin-out' of these contacts ?
> Will just connecting them together be enough or do I have
> to supply 6 volt to them (4 x 1.5 volt is used in the winder ) ?

I also have a pair of OM-10's.  I use two winders (one for each camera).
These each have a 2.5mm mini phone jack, which can be used to trigger each
one from a remote switch.

For situations where I am using the two cameras on a bar like you are doing,
I run two cables, each of which has a 2.5mm mini phone plug, to a common
momentary push-button switch.  Pressing the button fires both cameras, and
the sync appears to be very good.  I have used it for shooting pictures of
galloping horses at an equestrian show (1/1000 sec. exposure time), and
their hooves appear to be in the exact same position in each eye view.

For situations where I need a very wide stereo base, like hypers of
fireworks, I put each camera on a separate tripod, about 20 meters apart,
and use long focal length lenses.  Then, I plug RF receivers into each
winder jack.   Using a single RF transmitter, I send the signal pulse to
each camera simultaneously.  This is desirable even for time exposures, as
it is a good idea for both camera shutters to open at the same time and
close at the same time, to avoid getting different amounts of "bursts" in
each eye view.

This system works nice for miniaturization hypers also, where I shoot
"horizon scenics" from on top of mountains.  Cars on freeways in the valley
below are in the same position, as well as airplanes in the sky.

The original Olympus winders had the jacks already in them, but the local
camera dealer tells me that they are not made anymore.   So, I bought a pair
of unbranded winders (For about half the price of the original Olympus ones)
that just say "Electronic Power Winder for Olympus OM-10.   Made in China".
These did not have the jack.  But, I opened the cases, and found not only
the identical wiring, but a mount for a jack inside (they had just covered
it up on the outside).  So, I mounted jacks in them, hooked them up, and
they work just fine.

JR


 

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