Hi,
I'm preparing to add next pre-processing option to SpecFlare, with probably 
would be DOF.

What are the exualations for 

1) size of circle on 2d picture, created by sphere with radius X that is in 
distance D from camera, the formula may be relative. 
I quess it's R = (X/D) * const  where const depends on camera settings like 
angle and image settings like ratio,size?

2) size of circle on 2d picture, create by infinite small sphere (point) 
that is focal-blurred, CD is distance from camera, FD is distance from 
focal point ( FD<0 - point is close to camera, FD>0 - is far).


-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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