Mark Erickson wrote:
Keith,
The FA* lenses have the following properties:
o) They are faster than non-FA* lenses.
Speed of focusing?
Pentax autofocus works via a motor in the camera
body. Since there aren't equivalent (i.e., same
focal length and aperture) non-FA* lenses, this question
isn't really answerable. As Bruce Dayton mentioned,
the FA* lenses have a clutch system that disengages
the manual-focus ring when you use autofocus.
o) They are sharp (at least, the ones I own are).
High resolution and good contrast?
Sure. Better than other similar lenses? I don't
know. I haven't done a horse-race between, say, an
FA* 80-200 F2.8 and any of the non FA* zooms.
--Mark
