The Pentax 70-200mm f/2.8ED FA HD D DC Lens is a telephoto zoom designed for Pentax K-mount DSLRs.
Offering a 105-300mm-equivalent focal length range with APS-C cameras,
this lens is particularly well-suited to sports, landscape, and wildlife
uses, especially when working in trying light conditions. Extra-low
dispersion glass elements have been incorporated within the optical
design to minimize chromatic aberrations and distortions, as well as
produce a high degree of sharpness from edge-to-edge. HD and Aero Bright
coatings have also been applied to lens elements to reduce reflections
and flare and a Super Protect coating also helps to shield the front and
rear elements from dust, water, and oils. Further enabling its use in
difficult conditions, this 70-200mm f/2.8 also features a
weather-resistant construction with 13 separate seals to block moisture
and dust from entering the lens.
In regard to focusing, a DC autofocus motor realizes fast and quiet
performance and is accentuated by the Quick-Shift Focus System for
changing between AF and MF control by simply turning the focusing ring.
Additionally, a removable, rotating tripod collar is included with the
lens for more even balance when shooting atop a tripod.