http://www.dchome.net/viewthread.php?tid=719617&extra=page%3D1(Text in Traditional Chinese)And the tester's observation and comments are as follows:-1. AF is responsive outdoor, no hunting. But at lower light and when slower zooms are used, hunting occurred.2. Screw driven AF is faster than SDM, he compared the FA 31 and 77 Limited (My Remark: which are the most famous slow focusing Pentax film
