[pure-silver] Re: New color head "discoveries"
- From: "jayers" <jayers@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 13 Jan 2005 17:55:37 -0800
Kodak technical data/ chemical pub.#J-109 for Xtol developer which is
down loadable from Kodak goes into detail on the matter of C.I., E.I.
for all popular films developed by all the popular methods, and at
different dilutions.
Jonathan
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Koch, Gerald
Sent: Thursday, January 13, 2005 10:56 AM
To: 'pure-silver@xxxxxxxxxxxxx'
Subject: [pure-silver] Re: New color head "discoveries"
I adjust my film development times to yield negatives that print with
normal
contrast on VC paper *without* any filtration. Depending on the brand
of paper
this is comparable to a grade 2 to 2-1/2 graded paper. This usually
requires
developing for longer than the manufacturer's published times (which
seem to be
for condenser enlargers).
Agfa is the only manufacturer that I know of that publishes film
development
times for different gammas (CI or whatever). I use filtration only for
those
negatives which need some tweeking.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of Rob Champagne
Sent: Thursday, January 13, 2005 12:56 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: New color head "discoveries"
big snip
> The filters of a color head will not give you the full
>range of contrast available from VC paper with the use of
>dedicated filters. They should give you a couple contrast
>grades on either side of "normal" but filters should be used
>to obtain the maximum and minimum contrast values.
big snip
>---
>Richard Knoppow
I wonder whether my observation is true for other dichroic filter head
enlargers. The Ilford Y+M figures for grade 2 on my Durst CLS501 head
enlarger
give approx an ISO grade 1 result on paper. It occurs to me that because
dichroic filtration does not seem to give as much contrast as filter
sets, and
because most new enlargers have dichroic heads, that Ilford, and maybe
other
manufacturers, use this to its advantage in terms of film speed.
To get a true ISO grade 2 using ilfords G2 Y+M figures for my enlarger I
have to
give the negative more development which in turn gives allows a faster
film
speed. So what I'm speculating here is that modern film speeds may be
tailored
by the manufacturers to suit printing on dichroic heads with Y+M
filtration. It
should be noted that by using increased development of the negative the
overall
contrast obtainable from a dichroic is not far short of a true G5 and if
you
take neg development far enough then a true G5 is obtainable from a
dichroic
head.
It all depends on what you are tailoring your development to. Do it to
0
filtration and your negs will be too soft for G5 on dichroic settings.
Do it to
G2 Y+M settings of your dichroic head and you will get faster film speed
and
availability of higher contrast in your print.
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