[pure-silver] Re: Optimum results pushing 4x5 Tri-x 320 at 800 or 1600iso??
- From: Gerald Koch <gerald.koch@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 17 Sep 2012 08:10:18 -0700 (PDT)
I agree with Richard that Phenidone and it derivatives give "about a stop more
speed than box speed". The operative word here is "about". Additional speed
is dependant on the choice of developer and I would say that Xtol yields the
greatest speed increase. Even so texts that I am familiar with give a speed
increase closer to 2/3 stop rather than a full stop.
There is a saffety factor in the box speed of another 1 stop. So with careful
metering you should be able to get about 2 extra stops of speed. The advice to
bracket is a good one in circumstances such as described.
Jerry
--- On Mon, 9/17/12, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: Optimum results pushing 4x5 Tri-x 320 at 800 or
1600iso??
To: pure-silver@xxxxxxxxxxxxx
Date: Monday, September 17, 2012, 1:01 AM
----- Original Message ----- From: "Bogdan Karasek" <BKarasek@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, September 16, 2012 5:06 PM
Subject: [pure-silver] Optimum results pushing 4x5 Tri-x 320 at 800 or 1600iso??
> Hello,
>
> Needless to say, I got all sorts of contrary opinions as to how high you can
> push the iso of 4x5 TX 320asa and still get satisfactory results??? And what
> developer will give those results?
>
> They are building a new super-hospital campus with several 10-12 story
> buildings, not far from here, 15 minute walk. The sides are still open and
> the work lights are left on at night. Quite the spectacle. I want to catch
> this on the above mentioned 4x5 sheet film, before they close up the walls.
> I'm using a Toyo 4x5 CF with a 127/7.7 Ektar in a Supermatic shutter and a
> monopod. Lens standard set to infinity and use the viewfinder with the #4
> mask and three loaded Grafmatics.
>
> Any opinions dearly welcome.
>
> Cheers,
> Bogdan
I am sure you know that "pushing" mostly just increases the contrast. If
you use a developer with Phenidone or one of its cousins it will give you about
a stop more speed than the box speed, which is usually based on a developer
like D-76. Xtol, T-Max RS, Ilford DDX or whatever its called now, will do.
The data sheets for the developers and also the film sheets will give you some
guidance.
--
Richard Knoppow
Los Angeles
WB6KBL
dickburk@xxxxxxxxxxxxx
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