Archived posting to the Leica Users Group, 1999/07/25

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Subject: [Leica] Velvia at ISO 40
From: wvl <wvl@marinternet.com>
Date: Sun, 25 Jul 1999 20:36:00 -0700
 
> I have always shot Sensia and Provia at the nominal speed of 100 without
> encountering systematic underexposure (except when I mess up). So these
> films do not seem to require the 1/3 stop increase that Velvia does.
> 
> Nathan


I believe the Fuji website has an explanation of the rationale for using
40 on a 50 speed film.

Bill Lawlor