Re: [photo-3d] flash with twinned cameras

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

----- Original Message -----
From: "Jim Harp" <matmail2@xxxxxxxxxxxxx>
To: <photo-3d@xxxxxxxxxxxxxxx>
Sent: Tuesday, February 27, 2001 9:03 PM
Subject: [photo-3d] flash with twinned cameras


> ...Brian Reynolds once suggested that I consider
> trying flash bulbs, since their light lasts much longer than a strobe.
>
> Jim Harp

Years ago, there was a special flashbulb called an "FP", for focal plane.
It had a long persistence time, as it was designed to be used for focal
plane shutter cameras, illuminating the scene the entire time the shutter
was moving.  i don't know if these are still available, but if they are, it
sounds like they would be ideal for the above application.

If there is not much ambient light (as with outdoor night shots), a slow
shutter speed, or even "open shutter" bulb or time exposure can be used with
conventional or even electronic flash.  Only be careful that there are no
streetlights or other light sources in the scene, or they will be streaked.

Another technique is to build an external or internal single shutter that
covers both lenses.  Your existing shutters are only used as "capping
shutters".  The single shutter is closed, the individual shutters are
opened, then the single shutter is opened and closed, and the individual
shutters are closed.  If the single shutter is fitted with flash contacts,
you can be assured that if it is timed right, both sides will be equally
exposed by the flash. (If it is timed wrong, you won't get anything with
either lens - whatever happens to one camera will happen equally to the
other).

JR


 

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