John Francis wrote:
On Tue, May 12, 2009 at 12:32:47AM +0200, Frits W?thrich wrote:
John Francis wrote:
o Pentax put a 1/8000 shutter speed and 1/250 flash sync in the PZ-1p;
features that never showed up again in any future Pentax bodies (so
far; we'll see whether this remains true later this month).
Well, we have now a high speed sync, up to of 1/6000 isn't it? The 1/180
is only needed for older flashes.
Well, high-speed flash sync only works if you are prepared to accept a
flash with significantly less power. At 1/6000 (and a 1/180 sync speed)
the flash has to fire 32 times, once for each strip of the total frame.
That means you can't use more than 1/32 of the total light output on any
part of the exposure.
Seems to work just fine to overpower the full sun, anyway. I've used HSS
with the K20D and 540FGZ flash to shoot flowers in full sun and still
end up with a dark background and the flower lit only (mainly) by the
gel'ed flash. From 1/1000 up to 1/4000 sec. (I don't believe the K20
goes to 1/6000.)
I know the flash was working hard because of the additional recovery
time and that low whine you get when you pop the flash near full power.
-bmw
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