Designed as one of the new-generation Star series of lenses for use with PENTAX APS-C-format digital SLR cameras, this large-aperture standard zoom lens features an open aperture of F2.8 over the entire zoom range to deliver exceptional optical performance.
By incorporating the latest optical design technologies, the optics has been completely redesigned to assure high-resolution, high-contrast images even at open aperture. Compared with the existing smc PENTAX-DA★ 16-50mm F2.8ED AL[IF]SDM launched in July of 2007, this lens delivers greatly improved imaging performance.
It also incorporates a PLM (Pulse Motor) for the first time in a large-aperture lens to assure high-speed, low-noise autofocus operation. It is even fine-tuned for greater operability in manual-focus operation. This new zoom lens allows users to fully enjoy the process of photography according to their own preferences.
A new generation of lenses for optimal image quality
Designed as a member of the new-generation Star series, this lens compensates various aberrations to a minimum and delivers sharp, clear images, not only in the middle of the image field but at the edges. It delivers exceptionally high resolving power and outstanding contrast even at open aperture, while capturing beautiful images with a smooth transition of the bokeh (defocus) effect and a true-to-life depth of field.
High-speed AF system with a minimum focusing distance of 0.3 meters
This zoom lens incorporates a newly designed optical system which features a lighter, more compact focus-lens group. An advanced PLM (Pulse Motor) assures smooth, high-speed autofocus operation with minimized operational noise.
Electromagnetic diaphragm mechanism
The lens features an electromagnetic diaphragm control mechanism to assure high-precision exposure control. It also lets the user capture video clips using automatic exposure control, even when there are considerable differences in brightness during the video shooting. With a nine-blade circular diaphragm to produce a natural, beautiful bokeh (defocus) effect.
Dustproof, weather-resistant construction
Developed as an AW (All Weather) model, this zoom lens features a dustproof, weather-resistant construction to prevent the intrusion of water and dust particles into the lens interior. An SP (Super Protect) Coating keeps the lens front surface free of dust and stains.
**Effortless manual operation **
Quick-Shift Focus System provides an instant shift to manual focus operation. After locking the subject in focus during AF operation by pressing the camera’s shutter release button halfway down; this system can be used at any time during AF operation.