Digital BW, The Print

As you put more light on the negative, i.e., it turns darker, you must
reduce the film speed to gain shadow detail if you reduce development.
Conversely, as you put less light on the negative and increase development,
you must increase the film speed.   You can determine the speeds by trial
and (lots of) error, or you can determine the film speed by densitomer
readings.  I have them taped to my spotmeter for TMax 100 in TMax RS and PMK
pyro, and for TriX in D76 1:1.  It's in my backpack in another room, I've
been painting all day (not the artsy kind) and don't have the energy to go
get it, but it goes something like this with TMax 100 and TMax RS 1:9:
N=64.  N+1=100, N+2=125, N-2=40 or whatever, and so on.  Then the
development times decrease or increase for compressed or expanded
development, respectively.   Of course, this only works (when it works) for
sheet film where you may develop each sheet separately, unless you want to
carry a boatload of film magazines along.

Regards,

  --Ken Carney
    www.kencarney.com



----- Original Message -----
From: <newsletters@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Friday, January 10, 2003 10:55 AM
Subject: [Digital BW] Re: Zone Development Update (longish)



>
> I made a simple test yesterday that seems, to me, to validate that
> premise. Here was the set-up: I exposed took two rolls of film with
> each frame containing the same image.  I used the new plusx.  The
first
> roll was at my 'normal' EI 64 ( exposed 1/60s @ 5.6) developed in
D76
> 1:1 for 7:15.  The second roll was exposed at EI 40 (exposed 1/60s
@
> f4) and developed for 5:00 D76 1:1.
>
> As you would expect the 'normal' negative was much denser in the
> highlights.  I scanned one frame from each film strip on a
sprintscan
> 120 using vuescan.  The little density meter in vuescan (for
whatever
> it is worth) gave a density range of ~.35 to ~1.85 for the 'normal'
> negative  and ~.4 to ~1.5 for the N- negative.  I set vuescan to
scan
> B&W, 16 bit, Neutral color balance, with black and white points set
to
> 0%.
>

Something here that I don't understand. For having a N and N-1
negative you must expose them in the same way and develop
differently. You have made different expositions so you have here a N
negative and a "M negative" not a N-1.

Or, am I missing something??

Best Regards

Ant\ufffdnio Vieira
http://www.livinginabox.net



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