> Mark,
>
> Never used the FP setting myself. As I understand it, a flash bulb
> needed a certain amount of time to build to the full output of light.
> The FP setting would touch off the bulb ahead of time, so the full light
> output of the bulb would be available when the shutter opened.
>
> Bill Stanke
Yes, you are correct. However, I will elaborate :)
As far as the delay to get a flash bulb fully lit, I'm not sure
but, it's like asking how fast did that dynamite go off?
It's fairly fast...
FP setting is for a F-ocal P-lane shutter.
This also denotes a class of flash-bulb that burns long enough
and evenly for the slit in the focal plane shutter to traverse across
the focal plane - lighting the subject evenly.
Thus, you can use shutter speeds up to 1/1000th of a second.
The shutter curtain does not have to be open all at once which is what
causes the typical 1/60th of a second limitation with electronic flashes.
Shutter opens all of the way, triggers flash, shutter closes.
Cameras with higher X sync speeds use a faster mechanism
that can fully open and close the shutter curtain faster.
Typically, these are metal shutters and, have vertical travel rather
than horizontal (it's shorter that way - of course).
As opposed to a "M" setting which is a regular flash bulb used with
a leaf shutter camera. It does not burn as long as a FP bulb because,
it doesn't have to.
The new higher speed electronic flashes I'm guesing also just extend the
flash time.
Jon
Uh? Did that help?
>
> "M. Royer" wrote:
> >
> > I know this sounds really dumb, but what IS the
> > difference between all these different syncs. What
> > exactly is FP sync? How is it any diffrent from X and
> > what makes X so special. Pardon my ignorance. I've
> > only ever used T-flashes
> >
> > Mark Lloyd
> >
> > --- Michael Darling ?cosmo@xxxxxxxxxx? wrote:
> > ? In the past I've put a small drop of Locktite or
> > ? some other thread-lock
> > ? medium on that switch to keep it set to X. I NEVER
> > ? use FP sync, and AFAIK
> > ? never want to.
> > ?
> > ? Haven't had any problems since! :)
> > ?
> > ? Mike
> > ?
> > ?
> > ? on 1/23/02 7:17 AM, pirjol at
> > ? pirjol@xxxxxxxxxxxxxxxxx wrote:
> > ?
> > ? ?? Sounds to me like you're set to use focal-plane
> > ? flashbulbs. Find the
> > ? ? rotary
> > ? ?? switch and change it from "FP" to "X".
> > ? ?? Jim
> > ? ?
> > ? ? As I read this, I was thinking: "Of course it was
> > ? on X, I'm not that
> > ? ? dumb...".
> > ? ? And I went over to my OM and stared completely
> > ? stunned... The switch was on
> > ? ? FP!!! Oh my God! I can't believe I could do such a
> > ? mistake!
> > ? ?
> > ? ? All along, I was thinking of various explanations,
> > ? when it actually was so
> > ? ? simple!
> > ? ?
> > ? ? Thanks very very much.
> > ? ? Next time I'll double check.
> > ? ? cris
> >
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