[pure-silver] Re: New color head "discoveries"
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 13 Jan 2005 18:55:50 +0100
I assume you are talking about the log exposure range, when referring to
numbers from 0.6 to 1.8.
Well, log ER 0.6 is about grade 4.8, log ER 0.8 is grade 3.5 and log ER 1.55
is grade 0. A log ER of 0.8 is a bit low, but otherwise, you are not all
that far off workable conditions.
As Richard said, dedicated VC filters get the most contrast range from VC
papers, but I argue that you don¹t need that. If I could only get grade 1 to
3.5 from my color head (I do actually get 0 to 5), I could still print 98%
of my negatives. Sometimes I use a VC filter 5 to burn-in some local areas,
but otherwise, the extended contrast range of filters is true but
over-rated. And using a hard-contrast filter in addition to a color head is
actually very convenient, since it avoids resetting the dials.
I don¹t see a real problem here.
Regards
Ralph W. Lambrecht
On 1/13/05 1:39 AM, "J.R. Stewart" <jrstewart@xxxxxxxxxxxx> wrote:
> Well, my Omega Chromega Dichro DII came in last weekend and I've begun
> testing. with VC papers. First VC I've printed in 20 years.
>
> I've been using metol glycine based Ansco130 paper developer (modified by AA
> and without hydroquinone).That's where I started. Problem is, the hardest
> contrast I was able to get with 0Y/170M was about 0.8 on Forte Polygrade V
> (boy is that paper really blue!!) and about 0.6 on Kodak Polymax Fine Art.
> The softest contrast comes in about right at 1.8 (polymax) and 1.4
> (polygrade).
>
> Glycine is a much softer developer.. is that why I'm able to get no more
> than ISO ~3.5 on the VC papers... do the emulsions require stronger
> developers for satisfactory development? I tested my graded papers under
> white light exposure, developed them in A130, and acquired the right scale.
> I developed all the test prints at 6x factorial so I would think that would
> be sufficient, and I was able to get max black.
>
> I ran an Ansco 120 test last night. The test prints look better, but haven't
> read them yet.
>
> Also, I learned that both of these paper are very sensitive to the Thomas
> safelite... I ran a screening test and at 5 minutes exposure I got fog that
> appeared as Zone VI reflectance.. So, I move the safelight, unplug it, or
> change papers to one less sensitive, and retest. Such is life.
>
> J.R. Stewart
> Leesburg, VA
>
>
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