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Originally Posted by GreyWolf I am just surprised by the the extreme difference that you are reporting in CI from a graded paper to a VC paper.
Kind Regards, |
I was not especially surprised by the very large difference for the CI requirements of graded and VC papers because it is consistent with observations and examples made by Barry Thornton in the Edge of Darkness, which also show a difference of 2-3 grades. However, since some people have reported less of a difference there may be a variety of factors in play that need to be explored in more detail, including the type light in the enlarger, type of VC filters used, different spectral response of papers, etc.
So in that respect it may be useful to state all of the factors in play in my testing. Here is what I used for the test. My exposing light is a Beseler 23-C enlarger with the standard incandescent bulb (Wiko PH/111A, 125V75W). When I printed on the graded paper I did not use a filter. For the VC tests I used the Kodak Polymax filter set. The #2 filter is amber in color, while the #5 is strongly magenta.
As previously noted, the papers that I used were Arista, a graded #2 paper, and Arista VC paper. I did not verify if there was any difference in contrast with the VC papers in printing with a #2 filter and without it, though from past experience I know that if there is any difference it is quite small.
Sandy