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 lik
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 move
> 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 float
>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 t
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 developme
5 matches
Mail list logo
