Product Description
Exceptional imaging power
Consisting of 17 elements in 12 groups, the newly designed optics feature three
ED (Extra-low Dispersion) optical elements, one anomalous-dispersion-glass
aspherical optical element and three aspherical optical elements to accommodate
super-high-resolution image sensors. By assuring sufficient light levels even at
the edges of the image field and compensating various aberrations to a minimum,
it provides a high MTF (Modulation Transfer Function) and delivers
well-illustrated, fine-detailed images that are rich in contrast and resolution
across the entire image field. When mounted on a current PENTAX K-series camera
body, it uses only the central area of the image circle so that it delivers
high-resolution images with uniform image description over the entire image
field.
Large-aperture standard zoom lens
When mounted on a 35mm-format full-frame digital SLR camera body, this zoom lens
offers a zoom ratio of approximately 2.9 times to cover the ultra-wide-angle to
standard ranges (24mm to 70mm in focal length). It provides a maximum aperture
of F2.8 over the entire zoom range to deliver brilliant images. It not only
covers the focal-length range most frequently used for ordinary subjects, but
also provides ultra-wide-angle coverage to produce distinctive visual
expressions, such as exaggerated perspectives or extra-wide depths of field,
making it very useful with subjects such as sweeping landscapes and shallow
indoor scenes. When mounted on a current K-series digital SLR camera body, it
provides focal lengths from 37mm to 107mm in the 35mm format to cover wide-angle
to medium-telephoto ranges. Since its large maximum aperture not only creates an
excellent bokeh (defocus) effect on the background for beautiful portraits, but
also allows the photographer to handhold the camera for poorly illuminated
subjects, such as sunsets and indoor scenes.
Built-in SDM (Supersonic Direct-drive Motor)
Thanks to the incorporation of a new-generation SDM (Supersonic Direct-drive
Motor), this zoom lens assures quiet, high-speed autofocus operation, allowing
the photographer to react swiftly to all types of subjects.
Weather-resistant construction
This lens features a dependable weather-resistant construction with special
seals to effectively prevent the intrusion of water into the lens interior. By
pairing it with a weather-resistant PENTAX digital SLR camera body, it assures a
durable, dependable digital imaging system that performs superbly in demanding
shooting settings even in rain or mist, or in locations prone to water splashing
or spray.
HD Coating to improve image description
The lens is treated with 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.
Quick-Shift Focus system
The lens comes equipped with the PENTAX-developed Quick-Shift Focus system,
which allows the user to instantly switch to manual-focus operation after the
subject is captured in focus by the cameras AF system.
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