300mm f4 for Pentax ... Not much choice in terms of telephoto lens for Pentax. But look more closely, it seemed 300mm keep all its promises. I do not regret my choice. The object is superb, with a higher quality of finish NIKKOR I have had in the past. Autofocus is ultra quiet and precise. The sharpness is not the most impressive on the K3 but emerges sth my photos. The colors, the bokeh rendering general ... Am fan of this goal is actually quite small compared to its big brothers full frame. I recommend it to all lovers of nature.