>From my achives
Foxy
----- Original Message -----
From: "Giles" <cnocbui@xxxxxxxxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, February 01, 1999 5:53 PM
Subject: [OM] F280 contacts
The Ti has an FX contact in lieu of an X contact to operate the F280. This
contact is synchronised with the switching off of the trigger switch - when
the
first shutter blind starts travelling.
The Ti treats the output of the F280 as normal light and so varies the
shutter speed
during the exposure, rather than vary the output from the flash.
The clock terminal of the shoe conducts current normaly -low - (-3v). When
the
trigger switch opens the clock terminal becomes high impedance triggering
output
from the f280.
The D.B terminal is used to stop output from the f280. It is normaly low
(-3v) and
becomes high impedance in order to halt output.
There are five contacts in the Ti hot shoe. Looking at them from the back
of the
camera they are roughly in an H arrangement with one contact at the end of
each arm
and one on the crossbar. Top left is TTL, top right is L the middle contact
is X,
the bottom left is D.B and the bottom right is CLK.
Giles
Terry and Tracey wrote:
> would have to use to understand them would be significant. So, does anyone
> have info on how the F280 detects high speed sync, and what signals need
to
> be sent to it? I think it gets one pin to go to high speed mode and the
> other pin to turn it on. Does it supply it's own voltage (camera provides
a
> short circuit), or does the camera supply the voltage? I should be able to
> make something with opto isolators to make it work with my OM-1n.
>
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