Super-telephoto coverage with three-times zoom ratio
When mounted on a PENTAX K-mount SLR camera body, this zoom lens covers a super-telephoto range from approximately 230mm to 690mm in the 35mm format. It is designed to be compact and light enough to handhold during long-range shooting of such subjects as wildlife, aircraft and sports.
Outstanding image description
The state-of-the-art optics featuring three ED (Extra-low Dispersion) glass elements and one super-low dispersion glass element, effectively minimizes spherical and chromatic aberrations, while producing crisp, high-quality images free of color bleeding. Its MTF (Modulation Transfer Function) curve is programmed to be higher than those of conventional models in the same class to deliver high-resolution, fine-detailed images.
HD Coating to optimize image rendition
This lens is treated with the high-grade, multi-layer HD 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. * HD stands for High Definition.
All Weather Construction
This lens features dependable, dust-proof weather-resistant construction with 21 special seals to effectively prevent intrusion of water and dust particles into the lens interior. When used with a weather-resistant digital SLR camera body, it assures a durable, reliable digital imaging system that performs superbly in demanding shooting setting.
Improved Quick-Shift Focus System
The PENTAX-original Quick-Shift Focus System allows instant switching from autofocus to manual focus operation. Operability has been improved thanks to a three-position switch installed on this lens, allowing instant switching among QFS/A, QFS/M and MF modes. With a choice of three distinctive modes, the user is assured of speedier, more accurate focusing operation for a given subject or application.
This lens is equipped with 4 AF buttons, which provide more stable AF operation and better hold of the lens regardless of whether the user is shooting photos with the camera in a vertical and horizontal position. The user can assign preferred settings to these AF buttons including a Focus Preset Mode and AF Cancel Mode.
For more shooting convenience, press and hold the PRESET button to record a focus point after focusing.
Focus Range Limiter
Focus Range Limiter minimizes AF operation time by allowing the user to fix the focus range to one of three sub-ranges -- Full, close range (2 to 6m)* or far range (6m to ∞). *This limiter does not operate in manual focus.
Zoom Lock Switch
The zoom lock switch prevents the lens from extending under its own weight while you are carrying the camera.