On Monday, September 09, 2002 at 1:31, Tim Chakravorty
<olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] F280 Super FP revisited" saying:
> >Therefore, for an "FP" flash to work, it must always have
> > the same, long burn duration, regardless of shutter speed.
Yep.
> I think you are assuming that the flash remains ON for the entire time
> it takes the slit to traverse the focal plane. That may not be true. I
> remember reading somewhere that in super sync mode the flash output is
> not continuous but a series of pulses. How many pulses would that be..
...
Several thousand inside 1/25 second.
> From: "John A. Lind" <jlind@xxxxxxxxxxxx>
...
> > Super FP imposes noticeable limitations on working distance compared to
> > using the same film speed at X-sync with TTL Auto. The faster the shutter
> > speed, the greater the limitations.
No, the limitations are purely dependent on the ambient lighting.
The F280 is just another light source, and the dimmer the existing light,
the farther the F280 will reach. The shutter has the same effect on both
the F280 and the existing light above 1/25 second.
See http://www.fys.uio.no/~tbryhn/main/F280chart.html
tOM--
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tOM Trottier, ICQ:57647974 http://abacurial.com
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awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
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