Sigma 17 70mm f28 4 DC OS Lens for Pentax AF

This compact standard zoom lens offers great image quality coupled with impressive low light performance thanks to its wide f2.8 maximum aperture and OS image stabilisation.Optical FeaturesThe Sigma 17 70mm DC OS lens features both ELD Extra Low Dispersion and aspherical lens elements to ensure aberrations are minimised and sharp, high contrast images are produced throughout the zoom range.Great Low Light PerformanceThis lens, as mentioned previously has a wide maximum aperture of f2.8 at 17mm focal length. This allows more light to pass onto the image sensor, so allowing faster shutter speeds to be used. This also means that the optical image stabiliser doesn't have to work as hard to steady any shake. This OS Optical Stabiliser gives up to four more stops than would otherwise be possible.Closeup PerformanceFeatures a great 12.7 macro magnification ratio thanks to its close 22cm minimum focusing distance. Ideal for taking detailed nature or hobby images.Super Multi Layer CoatingDesigned especially for digital SLRs, this system helps to eliminate ghosting effects on the image sensor as well as traditional flare problems associated with all lenses.HSM FocusThe Hyper Sonic Motor focusing system gives fast, quiet and accurate autofocus, plus it’s all internal, allowing hoods and filters to be easily fitted. A Zoom Lock function is included as well which stops the lens barrel slipping under its own weight. Also useful when transporting the lens.Additional SpecificationsLens Construction 17 Elements in 13 GroupsAngle of View 72.4° 20.2°Aperture Blades 7 RoundedMinimum Aperture f22Supplied Accessories Lens Hood, Front and Rear Caps, Manual and Warranty Card