[pure-silver] Re: New color head "discoveries"
- From: "Rob Champagne" <app@xxxxxxxxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 13 Jan 2005 18:46:15 +0000
Oops, I just replied to another of your mails thinking it was a response to
mine by mistake.
New years resolution: "I really must read all the mail before replying."
At 13/01/2005 19:18 +0100, you wrote:
>That is a good point. If one has frequently the need for more contrast,
>while printing, the negatives are either underexposed, underdeveloped, or
>both (assuming the filtration is OK). Changing exposure and/or development
>can remedy the situation.
>
>
>
>
>Regards
>
>
>
>Ralph W. Lambrecht
>
>
>
>
>
>
>
>On 1/13/05 6:56 PM, "Rob Champagne" <app@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> 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.
>>
>> ==============================================================================
>> ===============================
>> To unsubscribe from this list, go to www.freelists.org and logon to your
>> account (the same e-mail address and password you set-up when you
>> subscribed,)
>> and unsubscribe from there.
>
>
>
>=============================================================================================================
>To unsubscribe from this list, go to www.freelists.org and logon to your
>account (the same e-mail address and password you set-up when you subscribed,)
>and unsubscribe from there.
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
