OK, I understand the math ... but what is the diffuser?  How do I
measure it?  Where do I find it? 

William Robb wrote:
 
> Basic geometery. The size of the diffuser needs to be somewhat
> bigger than the diagonal of the negative.
> As an example, the 35mm format is nominally 24x36mm.
> To get the diagonal, add the squares of the length and width
> together, then take the square root of that sum:
> (24 x 24) + (36 x 36) = 1872.
> The square root of that is ~43.266 mm.
-- 
Shel Belinkoff
mailto:[EMAIL PROTECTED]
http://home.earthlink.net/~belinkoff/
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