Originally posted by Designosophy I'm astounded by 1) The image quality, even wide open, 2) the AF speed, which is (surprisingly) among the fastest I've ever encountered, and 3) the AF accuracy on my K-5
I will second that! Comments in the lens review section of this forum tend to say the 50-135 AF is ok if you want to shoot a snail race but I get nice shots of my kids indoor sports activities (figure skating, cheerleading, basketball and badminton). And 50-135 is such a nice range for aps-c, and the lens doesn't weigh a ton like a 70-200. My favorite lens by far.