Recently barry c. wrote:
>
> I am currently trying to decide between the Pentax
> 100mm f2.8 Macro Autofocus SMC-F and SMCP-FA versions.
>
> Optically, are they similar? I can pick up the *F*
> version for about $10 less used compared with the *FA*
> version.
Hi,
Yes, optically they are identical. The outer design is a bit different
(the F lens matches the SF bodies and the FA is black like the Z/PZ and
MZ/ZX bodies.
http://www.phred.org/pentax/k/lenses/long/primes/
The general differences between F and FA lenses apply in this case too.
http://www.phred.org/pentax/k/FAQ/summary/
http://www.phred.org/pentax/k/FAQ/K-mount/
Cheers,
Boz
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