When mounted on the PENTAX K-1 full-frame digital SLR camera body, the lens provides an ultra-wide-angle focal-length coverage from 15mm to 30mm. Its exaggerated perspective helps the photographer produce spectacular landscape photographs. With a 30mm focal length at the telephoto end, the lens is also well-suited to portrait and street photography.
The zoom lens incorporates three ED (Extra-low Dispersion) glass optical elements and three aspherical optical elements in its 18-element, 13-group optics to deliver high-resolution images rich in contrast even at the edges of the image field, while effectively minimizing distortion and chromatic aberration.
With a maximum aperture of F2.8 over its entire zoom range, this lens is versatile enough to be used for many different subjects and scenes, ranging from sweeping landscapes to nightscapes and starry skies. Despite its ultra-wide-angle perspective, it captures subjects with beautiful soft bokeh (defocus soft blurring effect on the background). With a minimum focusing distance of just 28cm, this lens can capture subjects with a well-defined sense of depth.
The incorporation of a new-generation SDM (Supersonic Direct-drive Motor) assures that this zoom lens provides quiet, high-speed autofocus operation, letting the photographer react swiftly to all types of subjects.
Special seals applied throughout the lens body provide this zoom lens with dependable weather-resistant construction, effectively preventing the intrusion of water into the lens interior. By pairing it with a weather-resistant PENTAX digital SLR camera body, the photographer has a durable, dependable digital imaging system that performs superbly under demanding shooting conditions — even in the rain or mist, or at locations prone to water splashes or spray.
The lens is treated with high-grade, multi-layer HD (High Definition) coating. Compared with conventional multi-layer coatings, this PENTAX-original coating assures higher light transmittance and less reflection to deliver bright, high-contrast images free of flare and ghost images, even under demanding lighting conditions such as backlight.
• Quick-Shift Focus System for instant switching from autofocus to manual-focus operation, by holding the shutter-release button halfway down and turning the
focus ring after the subject is captured in focus by the camera’s AF system.
• Rounded diaphragm with nine blades produces a smooth, beautiful bokeh (defocus) effect, while minimizing the streaking effect of point light sources.
• SP (Super Protect) coating applied to the front surface of the lens to effectively repel water and grease.