FP sync is designed for flash bulbs which are appreciably slowr to 'light
up' than electronic flash (as are all flash bulbs) but additionally are
deliberately slow-burning for use with Focal plane shutters. Electronic
flash is pretty much instant to light up, and much weaker in output compared
to bulbs, but *not* 'slow-burning', and therefore does not get the chance to
dump sufficient of its light on the film frame.
X sync triggers the flash immediately the first shutter curtain is open, and
if you use a shutter speed of 1/60, the whole film frame is exposed at the
same time.
Take a look at the eSIF where you can find the instruction manual for the
original OM-1, which has a table setting out the sync speeds possible for FP
and M flashbulbs, as well as electronic flash. Good luck finding some FP
bulbs!
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Roberto Ciocca
Sent: 20 March 2004 13:29
To: olympus@xxxxxxxxxx
Subject: [OM] X & FP
I imagine this for most is a silly question, not for a user of my level and
with no detailed instruction about my new-used OM-1.
I discovered that witn an electronic flash mounted on hot shoe 1 of my
OM-1 the flash light shots, regardeless of the position of the FP-X switch.
On the contrary exposure of film is correct on X position, totally under
exposed when on FP position.
My question is which is the tecnical reason for this to happen. Thanks,
Roberto.
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