In addition to what John wrote:
Particular to the Oly Pen F series, because of the type of shutter
that it has, X-Synch is covered by all shutter speeds up to the top seed
of 1/500 sec.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"John A. Lind" wrote:
>
> At 00:27 12/17/01, you wrote:
> >Howdy,
> > I guess I'll try to make this question a little more generic. If
> > my electronic flash fires with M-synch, but not X-synch. Is it possible
> > that I am _in fact_ getting X synch? I just don't know how these
> > actually work. Camera is Pen FT.
> >Thanks,
> >MEBachofen
>
> Not certain if you're asking about what the generic difference is between
> M-sync, F-sync, FP-sync and X-sync, or exactly what the triggering
> mechanism is in your Pen FT.
>
> Short answer: NO
>
> M-sync is for flash bulbs and pre-fires the flash about 20 milliseconds
> prior to the shutter being fully open. Typical sync speed is 1/25th or
> 1/30th second because burn duration of a flash bulb is much longer than for
> a strobe.
>
> X-sync is for electronic flash with zero pre-fire. It triggers in the
> middle of the time the shutter is fully open. Typical sync speed was
> 1/60th for a very long time. However, "F" type flashbulbs could often be
> used with X-sync *if* a 1/25th or 1/30th shutter speed was also used.
>
snip snip snip
>
> === Electronic Strobe and "X" sync ===
> With the advent of electronic strobes, the "X" sync was added. This has
> zero pre-fire as a strobe has near instantaneous output for a very short
> duration compared to flash bulbs. Some older cameras only have an "M" and
> "X" sync selection. These are the models that often allow using "X" sync
> with an "F" bulb, provided a slow enough shutter speed is also used (1/30th
> second is 33 milliseconds; 1/25th is 40 milliseconds).
>
> -- John
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