[pure-silver] Re: New color head "discoveries"
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 13 Jan 2005 21:46:31 +0100
I'm lost now. There is a knot in my brain, and I can't untie it.
Regards
Ralph W. Lambrecht
On 1/13/05 7:46 PM, "Rob Champagne" <app@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> 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.
>>>
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>>
>>
>>
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