Archived posting to the Leica Users Group, 2002/01/06

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Subject: Re: [Leica] shutterbug...real film speeds...
From: "Mike Durling" <durling@widomaker.com>
Date: Sun, 6 Jan 2002 10:37:39 -0500
References: <B85C99D8.1868D%dante@umich.edu>

Not only did Kodak recommend more exposure they called for more development
as well.  I came across a data sheet from about 1940 that recommends
developing Super-XX for 24 minutes and Panatomic-X for 20 minutes in D-76
straight at 65F!

Mike D

- ----- Original Message -----
From: <dante@umich.edu>
To: <leica-users@mejac.palo-alto.ca.us>
Sent: Saturday, January 05, 2002 11:54 AM
Subject: Re: [Leica] shutterbug...real film speeds...


>
> 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
> > --
> > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html
>
> --
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In reply to: Message from "dante@umich.edu" <dante@umich.edu> (Re: [Leica] shutterbug...real film speeds...)