Check out
http://www.cdegroot.com/archives/yashicacontax-slr/199905/msg00087.html
for a summary of the collaboration between Pentax and Zeiss by someone paraphrasing a
book by an Asahi historian. It provides some details about how the coatings and two or
three lenses began as joint
Interestingly, the article also mentions the 18mm lens
as to result from the joint development of Pentax and
Zeiss. I have never found a confirmation information
about that anywhere. However, I have a diagram of the
Contax Distagon 18/4. This shows that it's design is
exactly identical to that
I could be mistaken, but as I can see, Pentax do not seem to use
floating element design like the other manufacturers. I know Nikon
use it. Any idea?
I think that one of the Pentax lenses that may supposedly have
involved some Zeiss/Pentax collaboration is the the K 28/2, which
uses a
F Actually, though, it is not clear in my mind, but wouldn't IF
F lenses be, in effect, lenses that have floating elements (inasmuch
F as one or more elements move relative to the other elements when
F focusing)? Or, to put it another way, couldn't the term be applied
F to any lens that moves
If you over generalize, then yes, IF = floating element.
In the case of Nikon, they refer to a floating element
design, for wide angles, as Close-Range Correction
(CRC). It's intended to improve performance of the lens
when focused close. Aside from the single CRC element
the lens focuses
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