[pure-silver] Re: please help - films not marked

  • From: Janet Cull <jcull@xxxxxxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Sat, 12 Jan 2008 21:08:15 -0500

I passed your comments on and the photographer said to give you both a big thank you!


Janet


On Jan 12, 2008, at 8:58 PM, Richard Knoppow wrote:


----- Original Message ----- From: "Janet Cull" <jcull@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, January 12, 2008 5:20 PM
Subject: [pure-silver] please help - films not marked


This is a plea for help from another photographer.  I told her I'd
ask you guys, because you know just about everything.  ;o) Thanks.

Janet


>>>I took some photos of a friend's 11 day old baby girl >>>while we
were home in MN. One roll of HP5+ 400 I rated at 800, the other at
400. Unfortunately, I wasn't smart enough to label which roll was
which and now I have no idea. I have 3 developers I can use, Rodinal,
D-76 and Xtol (which I haven't ever tried before).

According to digitaltruth.com, if I used Rodinal there is a 7.5
minute difference in developing time between HP5+ 400 rated at 400
and 800. Yikes. For D-76 the difference is 3.5 minutes and for the
Xtol it's 2.5 minutes. Should I go for the Xtol since there seems to
be the least amount of time difference in development? Would you
split it right down the middle or would you choose the 400 ISO or 800
ISO time? Any advice or tips would be really helpful.

I've learned my lesson, that's for sure! Always mark your film!<<<

HP-5 has enough underexposure latitude to tollerate the one stop error. Both films should be developed normally. Otherwise she will wind up with two rolls of high contrast images and not much improvement in the shadow detail of the underesposed one. I should point out there that there is really no such thing is pushing film. What happens is that increased development increases overall contrast. The low exposure end of the curve, the toe, is lower in contrast than the rest so that when most of the image is on the toe increasing development will make it more printable, however, there is no real increase in speed and those parts of the image lying on the straight line part of the curve will become too contrasty. Note that Kodak's recommendeations for T-Max are to develop a one stop underexposure at normal times.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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