> Focus limiters help alot with prevent the lens from racking back and > forth through the entire focus throw, but you still end up with a lens > with an unusually long throw even over the limited range which results > in pedestrian AF speeds.
> Adam A quote from the following test of the Pentax FA100/2.8: http://www.photozone.de/pentax/130-pentax-smc-fa-100mm-f28-macro-review--lab-test-report "The FA 100mm f/2.8 has no internal AF motor and relies on a slotted drive screw operated by the camera. It takes quite a while if you feel the need to AF from infinity towards 1:1 magnification. In other words - the AF is a bit lame, prone to hunting and fairly noisy. However, macro users often prefer manual focusing anyway and for mainstream applications you can take advantage of the focus limiter. When restricting the AF to a range between 0.6m-infinity the AF speed is actually very fast and leaves nothing to be desired here." The Tamron limiter restricts focus to 1.5m - Infinity, the AF speed is fast enough to capture moving subjects. John -- 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.
