Archived posting to the Leica Users Group, 2002/03/07

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Subject: RE: [Leica] HSS with M7 and Metz 54MZ3. First testing.
From: "Frank Filippone" <red735i@earthlink.net>
Date: Thu, 7 Mar 2002 10:07:49 -0800

Reciprocity is usually considered an artifact of long exposures.  But
Edgerton ( sp?) found that at short exposures, film behaved similarly.   If
you check some films  you will notice exposure ranges that are specified for
up to such as fraction of a second.  This fraction may be 1/50,000, but it
has a limit before reciprocity kicks in.

If the Leica repeated flash time is as fast as Lucien has indicated, whereby
it looks like 1 constant flash time, then my concern is that the flash
duration of a single pulse may be so fast that some film(s) may lose film
speed....

Has anyone seen comment by Leica on this subject?

Note... Edgerton is the guy that used flash for photography for the first
time in the 40's..... at MIT, and estblished the US company called EG+G.  He
is the undisputed father of flash photography.

Frank Filippone
red735i@earthlink.net

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