Brian, I have this lens in Pentax mount. Overall it is an OK performer. AF speed is average compared to others that I use with my *istD. Sharpness is pretty good at one or two stops down. It is best at mid range (250-400mm), just as you would expect with a zoom.
The two low points for the lens is the slow max aperture and the length it extends when zoomed. It is not a lens that can be used handheld (over 300mm), nor is it very useful for sporting events (due to the speed). I find that I get more use from my APO 300/F4. When I need the extra reach the APO 1.4x in combo with the 300 gives a little better results compared to the 170-500, in a package that is easier to manage. Of course this combo only reaches 420mm so it is not an perfect replacement for the 500mm. Perry. On 2/21/06, Brian Dipert <[EMAIL PROTECTED]> wrote: > Anyone have this lens mounted to their AF body...ideally a *istD? Feedback? > Thanks in advance! > ============================== > Brian Dipert > Senior Technical Editor: Mass Storage, Multimedia (audio, displays, 2-D and > 3-D graphics, and still and video imaging), PCs and Peripherals > EDN Magazine: http://www.edn.com > My blog: http://www.edn.com/briansbrain > 5000 V Street > Sacramento, CA 95817 > (916) 760-0159, fax (781) 734-8038 > mailto:[EMAIL PROTECTED] > Visit me at http://www.bdipert.com > > -- <----------------------------------------------------> Perry Pellechia Primary email: [EMAIL PROTECTED] Alternate email: [EMAIL PROTECTED] Home Page: http://homer.chem.sc.edu/perry <---------------------------------------------------->
