:If aperture were perfect, i.e.
:infinite number of shutter blades (or a fixed circular aperture), no wave
:front distortion, no anomalous dispersion, no internal surface reflections
:or losses (ideal coatings) and on and on, a PERFECT lense, one capable of
:imaging an extended object with NO error, then what of bokeh?
: Would this produce perfect, i.e. idealized bokeh or possibly no
:bokeh at all?
As I understand it, bokeh stands for the quality of out of focus parts in
the image, specifically in the high light. So as long as there are parts in
the image that are out of focus, you can speak of 'bokeh'. The less blades,
the worse the bokeh can become. Tonight I saw a perfect example of bad bokeh
in a movie: while the camera focused from the background to the front, the
highlights in the background changed into squares. Four aperture blades.
Mirror lenses imho don't have bad or good bokeh, just weird bokeh.
Hans
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