With its large maximum aperture of F2.8 throughout its entire zoom range, the lens provides many of the benefits of a large-aperture lens, such as a beautiful bokeh (out of focus) effect, and the use of faster shutter speeds to reduce camera shaking during shooting at dimly lit locations. When mounted on a PENTAX Q-mount digital camera body, it covers focal lengths from 83mm medium telephoto to 249mm telephoto (in the 35mm format) to accommodate a wide range of subjects and applications, including portraits, sports events and landscapes.
In order to optimize image rendition, this zoom lens incorporates two ED (Extra-low Dispersion) glass elements and one super-low dispersion glass element in its optics to compensate for chromatic aberration over the entire zoom range.
Measuring 56 millimeters in length and 50 millimeters in diameter and weighing a mere 90 grams, this zoom lens is designed to be extremely compact and lightweight. By turning the zoom ring to the click-stop storage marker positioned next to the 15mm focal-length index, the front portion of the lens can be retracted and locked into the lens barrel to further reduce its overall length.
Other features include a Quick-Shift Focus system for instant switching to manual-focus operation after the subject is captured in focus by the camera?s AF system. A protection coating has been also applied to the front surface of the optics to block dust and dirt.
|Lens Construction||14 elements in 10 groups|
|Angle of View||29.0°- 9.9°|
|Focal Length (in 35mm format)||15mm - 45mm (83.0mm-249.0mm）|
|SP (Super Protect) Coating||〇|
|Minimum Focusing Distance||1.0m (whole zoom area)|
|Maximum Magnification||approx. 0.05x|
|Minimum Length||56.0mm (When lens is stored)|