Digital BW, The Print

Hi Bruce,

> Pure speculation here:  I think that the bokeh is not a property
> "designed"
> into these lenses, but rather a function of the distance of the lens
> position to the film plane.

Nope.  It's intentional in the cases of Leica and Zeiss.  This paper will
show you what the key elements of the property are, and how they are
derived:

http://www.darkroom.com/MiscDocs/bokeh.pdf

Austin