[pure-silver] Re: Enlarger lens

On Saturday 30 June 2007 12:41, İbrahim Pamuk wrote:
> Thanks for everyone. I understand that I need a test between two lenses. As
> soon as I do I will tell my results.
>
> As you have understood I am about to change my enlarger. My old one does
> not have a head for color adjustments so I used to work with variable
> contast filters. Now I have the change. One thing I want to learn is that,
> for contasrt grades, it is published as two sets of data, one having one
> color and another one having two colors equivalent contast grades. What is
> the difference in between them. At first step I understand with two color
> data it was aimed to have exposore to be same throught out the range to be
> same.

        That's it really. Two colour contrast numbers are supposed to be speed 
matched.

        Nick
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