At 02:09 12/17/01, you wrote:
I'm selling a T20 flash and a prospective buyer has asked me if it will work
with his OM10 (by 'work' I believe he means as a TTL flash).
Well it?
Allan
He might be pulling your chain, or he may have forgotten, or he may never
have known. The OM-10 cannot control *any* flash TTL because it doesn't
have the required circuitry for it. The OM-10 has only two contacts on the
hot shoe (not three). The large one is the center "trigger" contact, and
the smaller, off center one is the "flash ready" contact. All "T" series
will work in Manual or in Normal-Auto with an OM-10, but not TTL. In using
it on an OM-10, the panel on the back of the flash should have the
"calculator" side facing outward.
In Manual and Normal-Auto modes, it will illuminate a red LED inside the
viewfinder and automagically switch the camera shutter speed to ~1/60th
X-sync when the flash is fully charged.
In Normal-Auto, the same red LED in the viewfinder will flicker immediately
after the flash fires *if* the T-20's built-in sensor determines it was
able to provide enough light for a proper exposure. The user should set
the calculator panel to the film speed, select one of the two apertures
using the slide switch below the panel, and set lens aperture to the one
selected on the flash.
In Manual, the user should set the calculator to the film speed and set the
slide switch below the panel to the Manual position. Determine subject
distance, find it on the panel and use the aperture just below that
distance to set the lens aperture. The flash always dumps full output in
Manual mode.
Note: The OM bodies that can operate a "T" series TTL (OM-PC, OM-2's,
OM-4's, etc.) have a third small, off center contact on the hot shoe to
"quench" the flash. It is this third contact that is used for TTL control.
-- John
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