[pure-silver] Re: New color head "discoveries"
- From: "Rob Champagne" <app@xxxxxxxxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 13 Jan 2005 22:40:15 +0000
I have not used polymax and Kodak do not seem to give combined Y+M filtration
figures in their data sheets so I am none the wiser. My Observation may just be
applicable to my paper/enlarger combination but without testing other papers to
the same extent I may never know.
At 13/01/2005 15:06 -0500, you wrote:
>I have never had any problem getting sufficient contrast.
>
>I do not use graded paper and have no way to compare.
>
>I use a color head since it gives me the advantage of using a single filter. I
>am usually not interested in maintaining a constant exposure time. I like a
>bit
>of snap in my prints but if I should ever want a true grade 2 then I would add
>a
>bit of yellow rather than using no filtration. Kodak says that for my enlarger
>and their Polymax paper 10Y = G2 and 20M = G2-1/2.
>
>-----Original Message-----
>From: pure-silver-bounce@xxxxxxxxxxxxx
>[mailto:pure-silver-bounce@xxxxxxxxxxxxx]
>On Behalf Of Rob Champagne
>Sent: Thursday, January 13, 2005 2:22 PM
>To: pure-silver@xxxxxxxxxxxxx
>Subject: [pure-silver] Re: New color head "discoveries"
>
>
>Doing it this way do you find it difficult to get high contrast on VC paper
>when
>needed and
>what happens when you dial in your paper manufacturers recommended setting for
>grade 2, i.e. does contrast up, down or stay about the same?
>
>I suspect that Ilford work closely with Durst in the testing of their papers
>which may explain my observations being somewaht different from yours if you
>are
>not using a Durst dichroic head.
>
>At 13/01/2005 13:56 -0500, you wrote:
>>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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