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Re: filmscanners: (OT) Pixels per inch vs DPI
For the record, we use ProFoto studio lights, where we've experienced the
250th of a second cut off of lighting output on our Polaroids.
partner, SKID Photography, NYC
Black Line 2400 watt-second has a flash duration of 1/300th second, and
shorter if you dial down the power. That's typical of studio power
packs. That duration is measured between the 10 percent points.
I'm not sure why you'd care about latency (I have to admit I haven't been
following this off-topic discussion closely). Latency (the time lag
it takes for the light out put to reach 10 percent of its peak) should
be measured in microseconds rather than milliseconds and should rarely
be of concern.
In a message dated 10/31/2001
3:56:05 PM Pacific Standard Time, email@example.com writes:
I thought the longest flash durations were in the neighborhood of
> 1/500th sec. I don't
recall seeing exposure differences at shutter
> speeds 1/250 or slower
where ambient light isn't a factor.
It takes "some" time for
the flash to actually fire...and I would also guess
different types of flashes
have different timing (latency). Does anyone
actually know what a typical
flashes latency time is?
I can check my Elinchroms
to see what they say this time is supposed to
be...as I have the service
manuals for them, and they are pretty
they'll have something to say about it.