[pure-silver] Re: Light source vignette or hopefully avoiding it

On Friday 14 July 2006 15:40, Nick Zentena wrote:


>       Could I draw the cone of light the image forms? Using the formulas for
> focus to define the triangles? That makes sense doesn't it? It's then a
> simple math problem. At least if I looking at the problem correctly.


        I did some back of the envelope work. It seems if the negative stage is 
more 
then about 3" above the 5x7 opening I should be okay. Using a 240mm lens. I 
wonder what a longer lens will do to things.  

        Nick
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