Archived posting to the Leica Users Group, 2004/01/26

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Subject: Re: [Leica] should be Tmax 3200 at 1600/was TriX at 800
From: Feli di Giorgio <feli@creocollective.com>
Date: 26 Jan 2004 18:43:49 -0800
References: <r02010100-1032-0A8ACB0E506B11D8829E000393D465D8@[10.0.1.8]>

> (Feli di Giorgio)> thoughtfully wrote: 
> >I have read that the true speed of TMX3200 is about 800-900asa, Delta
> >3200 is 1200asa and Neopan1600 is really about 640asa.
> >
> 

> Now what does this mean? I'm never clear on just what a films "real" speed is.
> How do you test it? How do you know?
> 
> Thanks
> 
> Adam
> --

I'm hoping that Richard Knoppow jumps in here and saves the day,
since I can only give you an amateur answer to that question.
I picked up the information from various people who dwell in the dark art
of measuring the density of their negatives etc.

Take it away Richard...


Feli


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In reply to: Message from Adam Bridge <abridge@mac.com> (Re: [Leica] should be Tmax 3200 at 1600/was TriX at 800)