Re: filmscanners: (OT) Pixels per inch vs DPI

["Dave King" <kingphoto@mindspring.com>]

That could explain this.  My 1000 w/s dynalites are probably shorter
duration than the 2400 w/s packs.  Love the Chemical Bros BTW.  Fun
stuff.

Dave

From: SKID Photography <skid@bway.net>
> 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.
>
> Harvey Ferdschneider
> partner, SKID Photography, NYC
>
> RogerMillerPhoto@aol.com wrote:
>
> > The Speedotron 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,
darkroom@ix.netcom.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
> >> comprehensive...hopefully, they'll have something to say about
it.
> >>
> >
> >
> >
>
>
>
>