in news:Y=jrPEh5upqZ+VuOysTVd5zUAMGp@4ax.com Glen Berry wrote:

> I want to know the specifics of focal_blur operation, to better
> emulate images from a 35mm camera.

Not an awnser to your questions, but the macro on this page may be of some 
help:

http://www.wozzeck.net/images/DoF.html

Ingo

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