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[OM] Bokeh, shmokeh [was Heliar (Was: 50mm 1.8 (Re: Hoarding & Varim

Subject: [OM] Bokeh, shmokeh [was Heliar (Was: 50mm 1.8 (Re: Hoarding & Varim
From: usher99@xxxxxxx
Date: Tue, 25 Jan 2011 20:09:07 -0500
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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