Summary: Excellent macro abilities, 100mm telephoto angle of view is perfect for cropping out unwanted subject matter. F 2.8 is great for some low light conditions, but is even better combined with the macro for depth of field control. I'm looking forward to shooting many close up shots with this lens.
Summary: I was courting this lens for long time, and I didn´t regard when it comes... It works well, fast, a little bit noisy (like old motor-engine), and in few times will become a rare jewel from Pentax.
Summary: I am very pleased indeed with this lens. It provides consistantly high quality images. My prime use is flowers and insects. It also makes a good portrait lens as well but I rarely use it for that.
Summary: Easy to focus and finetune with the focus ring but sometimes hunts, but less so now I'm used to it. Pin sharp macro work and good depth of field. Camera usually set at 100 ISO and lens is fine even in dull light.I took a long time deciding as I'm quite new to digital, this lens is equal to any of my film medium format and 135 kit.