Archived posting to the Leica Users Group, 2002/01/05

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Subject: Re: [Leica] shutterbug...real film speeds...
From: "dante@umich.edu" <dante@umich.edu>
Date: Sat, 05 Jan 2002 11:54:00 -0500

I would recommend taking a look at the old Kodak materials, when the speed
measurement was less dependent on using the toe.  Some examples (from
memory).

Verichrome pan - 64
Plus-X - 50
Tri-X - 200

Giving one stop extra exposure doesn't hurt in any event.

Dante

> From: Henning Wulff <henningw@archiphoto.com>
> Reply-To: leica-users@mejac.palo-alto.ca.us
> Date: Fri, 4 Jan 2002 17:42:07 -0800
> To: leica-users@mejac.palo-alto.ca.us
> Subject: Re: [Leica] shutterbug...real film speeds...
> 
> At 7:00 PM -0600 1/4/02, John Straus wrote:
>> on 1/4/02 5:32 PM, Henning Wulff at henningw@archiphoto.com wrote:
>> 
>>> That's exactly what I have found - about 2/3 stop slower, but finer
>>> and a bit more detail in the toe and highlights. I use it more like a
>>> very fine-grained FP4 rather than like a T-grain film. Anyway, Acros
>>> has permanently retired FP4+.
>> 
>> Where can you find info on the 'real' speed of the films out there? It seems
>> a lot of companies have inflated #'s so to speak. Foe example Fujis site
>> doesn't seem to have any useful info unless I'm not looking in the right
>> place...?
> 
> You gotta do your own. This is developer and processing as well as
> subject, filtration, how you meter and how your meter is adjusted
> dependent, as well as nominal ISO dependent. The manufacturers test
> according to proper standards and thus their stated speeds are real
> and accurate, it's just that their standards are going to be
> different than yours - guaranteed!
> 
> -- 
> *            Henning J. Wulff
> /|\      Wulff Photography & Design
> /###\   mailto:henningw@archiphoto.com
> |[ ]|     http://www.archiphoto.com
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Replies: Reply from "Mike Durling" <durling@widomaker.com> (Re: [Leica] shutterbug...real film speeds...)