The problem with using dual flashes is that the
result, assuming that both can be fired at almost the same time, is that each
flash
would strike the object at slightly different
angles, causing retinal rivalry. However there is a way that SOMETIMES
works with a
pair of unsynced cameras, but providing
that the cameras' shutter speeds can be set manually.
Electronic flashes usually fire at about 1/1000
sec. or faster. Set both cameras at about 1/60 sec. with the flash option turned
off on one of them.
Since 1/60 of a sec. is a much longer time period
than 1/1000 it's possible that if your two fingers were depressed within
reasonable sync, the
camera with the flash turned off will be able to
capture the flash from the other camera. In this case, you are
using both flashes almost as
substitutes for shutters. In
fact, since they are taking pictures at an effective speed of 1/1000 sec. or
faster, there may be no problems
associated with motion blur.
I was very successful with this approach using
film-based cameras, but have not tried this method with digital cameras.
Practice this approach
in a dimly-lit area, and if it works out, you're
ready to go!
Marshall
----- Original Message -----
Sent: Sunday, March 15, 2009 6:35
PM
Subject: Re: [Anaglyphs] the birthday
girl
Cute picture. Great cake!
I also use a
twin rig (not
SDM-compatible) and am wondering whether folks let both cameras flash or just
one. I've had bad luck with finger-sync and both cameras set to flash, so have
stopped doing indoor pix and it's been so gloomy or cold outside (weekends in
Washington, DC) for months that I've not taken any pictures (since
Inauguration Day).
