Hi William:
<< I've seen several people use the word "bokeh." Is this some special term
relating to the subjective image quality of a lens? Or is it just a
gross misspelling of the word "bouquet"? >>
We have some threads on this in the Archives. It is a Japanese origin term,
with no English translation, referring to the aesthetic quality of the out of
focus image gained from a combination of large aperture, long focal length and
many bladed diaphragm. It is also a consideration in cinematography. Watch
for the big, round, out of focus highlights in the next movie you go to. I
saw them early on in that 4th sequal to the Mel Gibson & Danny Glover series -
whatever it was called. (If you watch that on, look for Red Rocks National
Conservation Area, next to Las Vegas, be magically displaced to Los Angeles!)
> There was a time when many Olympus pocket cameras had 5 elements, rather
> than the "usual" 4 for a Tessar design. Does anyone know why?
It is my understanding, from references long forgotten, that 5 elements are
necessary to get f/2.8 out of an otherwise f/3.5 design, as well as to improve
the edge definition. The classic 4 element Tessar has great center
definition, but needs improvement when far off axis.
Gary Reese
Las Vegas, NV
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