True. And the in-lens motor seems to make a difference as well. The DA* 50-135/2.8 focuses more quickly and more accurately than the FA 50/1.4. Paul -------------- Original message ---------------------- From: Godfrey DiGiorgi <[EMAIL PROTECTED]> > > On Mar 30, 2008, at 12:01 PM, William Robb wrote: > > The extra stop of speed is a nice complement to the high ISO > > support. That extra stop gives the > > auto focus a lot more to work with. ... > > If and only if the lens maintains the same or better contrast wide open. > > I found that AF speed and accuracy with the FA20-35/4 was superior to > what I saw with the FA31 Limited ... presumably because the FA20-35 > wide open was more contrasty than the FA31 wide open. Conjecture but > it seemed borne out by other lenses as well. > > Godfrey > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions.
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