Main Features

Compact, lightweight telephoto zoom lens with outstanding portability.  Despite its compact, lightweight design weighing approximately 819 grams, this zoom lens covers the image circle of 35mm full-frame digital SLRs, and provides a focal length range of 70mm to 210mm to facilitate handheld outdoor photography. When mounted on an APS-C-format camera, its focal length range is extended to the equivalent of 107mm to 322mm in the 35mm format. Coupled with its compact, lightweight body, it can be easily integrated in any APS-C-format camera system.  In its 20-element, 14-group optics, it incorporates three ED (Extra-low Dispersion) glass elements and two anomalous dispersion glass elements to deliver high-contrast, high-resolution images with edge-to-edge sharpness, while effectively compensating for distortion and chromatic and coma aberrations.  Minimum focusing distance of 0.95 meter.  This lens can be used as a tele-macro lens as the minimum focusing distance of 0.95 meter has been achieved for both the tele and wide, with the maximum magnification, 0.32x.  By using with APS-C the maximum magnification is 0.48x.

to enhance imaging power

This lens features PENTAX’s latest HD Coating.* Compared to conventional multi-layer coatings, this high-grade, multi-layer coating not only improves light transmittance but also reduces average reflectance in the visible light range by more than 50 percent, minimizing the adverse effects of flare and ghost images even in demanding lighting conditions such as back lighting.
* HD is an abbreviation of High Definition.

Weather-resistant construction, perfect for outdoor photography.

This zoom lens features a weather-resistant construction to prevent the intrusion of water into the lens barrel. When mounted      on a PENTAX weather-resistant digital SLR camera body, it assures a durable, reliable digital imaging  system that performs superbly in demanding shooting settings — even in rain or mist, or at locations prone to water   splashes or spray.

Built-in SDM This lens incorporates a ring-type SDM (Supersonic Direct-drive Motor) to assure quiet, high-speed AF operation and improve operability in outdoor shooting.

Focus limiter Two-step focus range limiter, to minimize AF operation time

Electromagnetic diaphragm control* Provides high-precision exposure control during video shooting

*This lens features a KAF4 lens mount compatible with an electromagnetic diaphragm control system. Cameras compatible with this system are K-1 Mark II, K-1, K-3 II, KP, K-70, K-3, K-S2, K-S1 and K-50. For K-1, K-3 II, K-3, K-S2, K-S1 and K-50, the camera’s firmware must be upgraded to the latest version. If this lens is mounted on a camera without proper firmware upgrade, its diaphragm control mechanism becomes inactive, making it impossible to obtain correct exposure.

Other features

1. Quick-shift Focus System, to provide instant shift to manual-focus operation, after locking the subject in focus during AF operation by pressing the shutter-release button halfway down.
2. Nine-blade, round-shaped diaphragm, to produce a natural, beautiful bokeh (defocus) effect, while minimizing the streaking effect of point light sources.
3. SP coating to repel stains.  Applied by means of PENTAX-exclusive fluorine deposition process, this coating is highly repellent to water, grease and dirt, making it easy to wipe up stains such as fingerprints.  This frees the photographic from worries in outdoor photography.