Archived posting to the Leica Users Group, 2008/01/10

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Subject: [Leica] Obsolete Standards Question
From: marcsmall at comcast.net (Marc James Small)
Date: Thu Jan 10 16:42:37 2008
References: <003401c853d0$a2b4ccc0$e81e6640$@net>
 
At 04:34 PM 1/10/2008, Jim Shulman wrote:
 >I've been pouring through some vintage photo magazines recently, and have
 >seen film speeds referenced as Weston readings.  Does anyone have a
 >conversion chart of Weston to latter-day ISO ratings?
 >

It varies from emulsion to emulsion a bit, but a 
sound starting point is Weston = 80%  ASA.  Thus, 
a 400 ASA film should be rated on a Weston meter at 320.

I've been using a Weston 715 since 1961.

Marc


msmall@aya.yale.edu
Cha robh b?s fir gun ghr?s fir!
In reply to: Message from jshul at comcast.net (Jim Shulman) ([Leica] Obsolete Standards Question)