Re: demise of tri-x 8x10?

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From: Richard Knoppow (dickburk@ix.netcom.com)
Date: 09/28/02-01:18:23 AM Z

----- Original Message -----
From: "Carl Weese" <cweese@earthlink.net>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Thursday, September 26, 2002 3:11 PM
Subject: Re: demise of tri-x 8x10?

> Chunin,
>
> It's true that there are two very different films called
Tri-X. Both are
> highly useful. The TX version is high fog and early
shoulder, excellent for
> silver printing. The TXT version is low fog and almost no
shoulder,
> excellent for negatives to print in processes like Pt/Pd.
I haven't used a
> lot of Plus-X, but would call it about halfway between the
two Tri-X's in
> character. Oddly enough, if you like 35mm Tri-X, the sheet
film that comes
> closest to its behavior is probably Ilford HP5 Plus.
>
> ---Carl
>
> --
> web site with picture galleries
> and workshop information at:
>
> http://home.earthlink.net/~cweese/
>
> ----------
> >From: Chunin Martinez <chunin@cimphoto.com>
> >To: alt-photo-process-l@sask.usask.ca
> >Subject: Re: demise of tri-x 8x10?
> >Date: Thu, Sep 26, 2002, 4:01 PM
> >
>
  I would describe the differences somewhat differently. The
roll and sheet film versions of the two films differ in the
same way in terms of the characteristic curve. Both Plus-X
and Tri-X roll and 35mm films are medium-toe films with a
considerable straight line portion. They tend to reproduce
tones linearly. Plus-X and Tri-X sheet film are very long
toe. In fact, they are nearly all toe since neither film has
an appreciable straight line section. Plus-X pan sheet film
is somewhat more exagerated in this respect than Tri-X pan.
Both films have D/logE curves which are inflected upward
everywhere, meaning the contrast increases continuously with
density.
  Neither film is "high fog" and neither shoulders off any
any useful density, even the rather high ones sometimes
desired for Platinum printing. Dr. Richard Henry found that
Plus-X sheet film had an exposure latitude of twelve stops
overexposure. Such a dense negative would be extremely hard
to print but would still have fairly high highlight
contrast.
  Since the self masking effect of Platinum tends to flatten
out the shadows, and since long toe films do the same, a
short toe film like T-Max would probably yield more
satisfactory results. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com
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