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Re: [OM] OM-4 w/ T Series Flash Confusion....

Subject: Re: [OM] OM-4 w/ T Series Flash Confusion....
From: "Hans van Veluwen" <mail@xxxxxxxxxxxxxxxx>
Date: Tue, 30 Mar 1999 15:26:31 +0200
: My original goal - and original question to the group - was based on
finding
: a way to have a second/third flash at angles to subjects to handle harsh
: shadows across faces and backgrounds.  Could I skip the expense of adding
: two more T-32s that are "TTL" and simply by two slave units and two
cheaper
: flashes that would be positioned to the sides of the subject and that
would
: simply go off when the camera mounted T-20 goes off ?

Yes, as long as you realize that these slave-triggered flashes are not
controlled by the camera. Secundary flashes are normally used for fill-in
with a lower output, so you must know how to do that.
It can help if the slave-triggered flashes are computer flashes with two or
three selectable apertures. Then you can force a lower output by setting the
aperture on the flash two stops smaller than on the lens. For instance F8 on
the slave flash and F4 on the lens. If you deliberately want the main (TTL
controled) flash to underexpose, you can do that with the normal exposure
compensation dial.
You can also try the manual GN way: position the slave flash at a distance
that corresponds to an aperture two stops smaller than on the lens. You can
also reduce the GN by taping semi-transparent paper on the flash. Or
coloured paper for special effects.
If the slave flash is used as a hair light for halo effects, the output
power is less important. It is more important that this flash produces spot
output that doesn't directly hit the lens. A flash with built-in zoom head
can help, but you can also build a spot head from a cardboard cylinder.
It takes a lot of experimenting. The advantage of having all the flashes TTL
controlled is that it is easier to experiment with filters on the flash and
different flash distances because the overall effect is measured and
controlled by the camera, reducing the danger of overexposure.

Hans


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