I believe the Takumar F and the Pentax, (not SMC), F in 70-200 are the
same lens with different names. The Pentax F IIRC also came in FA like
livery but was pretty much the same lens as the Takumar. The FA
70-200mm f4.0~5.6 and the F 70-210mm f4.0~5.6 were different optical
formulas. The F is supposed to be better optically, (sharper, whatever
that means, since there's no objective measure of sharpness), at the
long end, the FA has better electronics and coatings. You pays your
money and you takes your choice.
Here's a sample of the SMC-P F 70=210mm at 210mm wide open.
https://dl.dropboxusercontent.com/u/1604247/PESO/PESO%20--%20%20watchdogrev.html
(Camera Pentax *ist-Ds)
On 5/29/2013 12:35 PM, John Francis wrote:
On Wed, May 29, 2013 at 02:59:50PM +0200, Alan C wrote:
The FA 70-200 is an SMC Pentax FA. Good reviews. (I have the
100-300mm which is very good)
The F 70-200 is a Pentax F (Cheaper line without MC).
Are you sure you meant to put that qualifier there?
AFAIK the F line (effectively the first auto-focus series)
had multi-coating, just like the earlier M and A lenses,
and the subsequent FA lenses. The difference between the
F and the FA lenses is mostly in the information that is
transmitted over the digital signal pin; while the exact
details escape me now I think it might be that the FA
lenses also tell the camera the focus distance the lens is
set to, which allows for more complex exposure metering.
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