“With the launch of the K-1 full frame camera, Pentax released three constant aperture lenses covering a large range, from ultra-wide to telephoto. We already reviewed the 70-200mm F2.8 and 24-70mm F2.8, and found them to be excellent performers. Today we continue this series with our test of the D FA 15-30mm F2.8 lens.
With this trio of fast, professional lenses, Pentax aims at gaining market shares in the full frame market. While only the 70-200mm is a STAR lens, all three are full-featured products, with silent autofocus, weather sealing and modern coatings.”
Read more at pentaxforums.com