Enjoyed that discussion and illustrations. I think it is probably
correct that it is easier to design lenses with smoother bokeh in
larger formats. Distant blurriness is largely a function of the
physical size of the aperture. At equivalent FOV a larger format
requires a longer FL and the physical aperture at a given f stop will
be larger. Bokeh in some respects can be a zero sum game as if the
foreground is improved the background may suffer---see below starting
at pg 25.
http://www.zeiss.com/c12567a8003b8b6f/embedtitelintern/cln_35_bokeh_en/$file/cln35_bokeh_en.pdf
That be said, "edgy bokeh" in some situations can be described as "
lively" and doesn't always seem to be a negative.
Some Zeiss lenses seem to have this character at many situations and
has been described to add to a "3D effect".
As Nasse and Moose both state the nature of the bokeh is complicated in
any given lens and can depend not only on the relative
foreground/subject/ background distances but focusing distance as well
as aperture of course.
Occasional fan of "bad" bokeh, Mike
Aren't there cine lenses with "swirl" bokeh?
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