[pure-silver] Re: Calibrating a colour enlarger to ISO paper grades wrt Way Beyond Monochrome
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 26 Nov 2009 22:36:43 +0100
Tom
I'm not sure that I understood your question. Can you try to be more
specific? What fig.# are you referring to?
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
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On Nov 26, 2009, at 20:35, Tom Kershaw wrote:
I suspect this message may be best directed towards Ralph W.
Lambrecht. Reading through the calibrating chapter in 'Way Beyond
Monochrome' I noticed the suggested filtration values given for a
Durst max. 130 unit enlarger are not symmetrical across yellow and
magenta. i.e. the step progressions between each value are not
numerically equivalent; is this correct, and how variable are these
values relatively across different manufacturers of enlargers? For
my DeVere 5108 model I applied a multiplication factor of 1.54, i.e.
130 becomes 200.2 units as the filtration values go upto '200'.
Tom
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