[pure-silver] Re: New color head "discoveries"
- From: "Rob Champagne" <app@xxxxxxxxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 13 Jan 2005 19:22:16 +0000
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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