At 15:37 1/24/00 , Doris Fang wrote:
>for short-DOF portraits in strong light. Did OM invent FP ? I thought
>they did not.
Depends on what invention specifically: the electronic strobe for it, or
first practical application of the concept?
I don't know about the electronic strobe version; Oly seemed to have one
around with the F280 before I heard about the others.
The concept is ancient! My circa 1954 Contax IIIa CD has "FP" sync for
1/100th to 1/1250th and I know it predates that! However, it was designed
to be used with flash bulbs such as the #26, a second cousin to the
blindingly high GN #25 or famous "Press 25."
Works much the same way. The sync triggers the flash about 15-20 msec
before the opening curtain is released. The #26 and others flash bulbs
like it are called "long duration" FP bulbs. They have a flat peak output
longer than normal ones that would keep a relatively constant light level
during opening and closing curtain travel. The GN on them plummeted with
increased shutter speed just like the electronic FP strobes.
Don't know *who* invented (developed?) "FP sync" or first put it on a
camera, but it's been around for at least 50 years. It was only a matter
of time before someone put enough electronics in a strobe to do the same
thing as long duration FP bulbs did.
-- John
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