Archived posting to the Leica Users Group, 1999/02/22

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Subject: Re: [Leica] B&W film speed
From: Mark Rabiner <mrabiner@concentric.net>
Date: Mon, 22 Feb 1999 11:49:43 -0800

Nathan Wajsman wrote:
> 
> Bob,
> 
> I agree with Martin that if you need 400 speed than you are probably better off
> using a film optimized for that speed. As far as 800, that is close enough to what
> we all agree is the "true" ISO speed of D3200, namely 1000 or 1200, that you might
> well get perfectly good negatives with a bit less developing.
> 
> Nathan
> 
> RBedw51767@aol.com wrote:
> 
> > Gib and Nathan:
> >
> > The wide latitude of Delta 3200 makes me wonder how it would perform in the
> > 400-800 ISO rating area.   I recently and stupidly mistook Delta 400 for Delta
> > 100 and exposed it at ISO 50.  The negatives were dramatically overexposed but
> > I believe would have been very nice if processed correctly.   This leads me to
> > believe that D3200 might work beautifully at 10% of it's recommended ISO
> > rating. I totally agree with Nathan about pushing film.     I don't really
> > know what to expect but the thoughts of a truly universal ISO film appeals to
> > me.
> >
> > Bob Bedwell
> 
 If it is like the TMax then when used with certain developers in that
case the Tmax developer which I don't care for it has a real speed of
3200. As I like other developers I shoot it at 1600, a stop less than
what is on the box which is no big deal but two stops faster than 400
which means I can shoot my new 135 indoors with no flash.
Using a compensating develper like Diafine, Acufine and a dozen others
you can squeeze an extra real stop out of Tri X or whatever putting you
at 800.
So to me this is a case of 800 against 3200 and two stops for me
constitutes a different ballgame.
For me I would rather shoot the 400 jacked up one then the 3200 jacked
down three (800). I think thats paying extra money for a real murky neg.
Tri X or Neopan in acufine makes for a good clean neg.
Mark Rabiner