[pure-silver] Re: Calibrating a colour enlarger to ISO paper grades wrt Way Beyond Monochrome

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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