A compact, lightweight design weighing approximately 819 grams makes this telephoto zoom lens the perfect companion for every photographic journey. Covering the 35mm image circle of full-frame DSLRs, the lens provides a focal length range of 70mm to 210mm, which is ideal for handheld outdoor photography. When used on an APS-C camera, the focal length is equivalent to 107mm to 322mm in the 35mm format.

The lens's optical construction consists of 20 elements in 14 groups, incorporating three ED (Extra-low Dispersion) glass elements and two anomalous dispersion glass elements. This advanced design delivers high-contrast, high-resolution images with edge-to-edge sharpness, while effectively compensating for distortion, chromatic, and coma aberrations.

In addition to a minimum focusing distance of 0.95 meters, the lens barrel was designed not to extend during operation, keeping the overall dimensions intact. This allows photographers to actively enjoy a wide range of outdoor shooting situations, including landscape, cityscape, close-up wildlife, and sports photography, where the portable design is particularly useful.

The lens features the latest HD Coating from PENTAX, which not only improves light transmission but also reduces average reflectance in the visible light range by more than 50 percent. This minimizes the adverse effects of flare and ghosting, even in challenging lighting conditions with backlit subjects.

For added durability, the lens boasts a weather-resistant construction that prevents water intrusion into the lens barrel. When paired with a PENTAX weather-resistant digital SLR camera body, it creates a reliable, high-performance digital imaging system that can withstand demanding outdoor conditions, such as rain, mist, or water splashes.

Further enhancing the lens's versatility, the front surface features SP (Super Protect) Coating, which is highly repellent to water, grease, and dirt, making it easy to wipe off stains like fingerprints. This frees the photographer from worries when shooting in the great outdoors.

The lens incorporates a ring-type SDM (Supersonic Direct-drive Motor) to ensure quiet, high-speed autofocus operation and improved operability during outdoor shooting. Additional features include a Quick-shift Focus System for instant manual focus adjustment, a two-step focus range limiter to minimize AF operation time, and a nine-blade, round-shaped diaphragm that produces a natural, beautiful bokeh effect while minimizing the streaking of point light sources.

When used with a compatible PENTAX K-series digital SLR camera, the lens benefits from the camera's built-in shake reduction (SR) mechanism, providing effective in-body image stabilization for sharp, blur-free results.

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