The HD Pentax-D FA 21mm F2.4ED Limited DC WR in silver is an ultra wide-angle, full frame lens which delivers outstanding imaging performance for sharp, crisp images without even in the peripheral areas. A built-in motor drives the AF mechanism for smooth, quiet autofocus operation. The high quality and weather-resistant construction, plus SP (Super Protect) Coating, gives you a wide-angle lens that performs superbly even in the most demanding shooting conditions.
Exclusive Limited-series quality with optimized image rendition
When used for landscapes, this lens assures solid, uniform image rendition across the image field. By further closing the aperture down, it delivers sharp, clear, high-resolution images, even at the edges. Its optical characteristics change for close-range photography. At open aperture, it provides a mild bokeh (defocused) effect in the background while capturing the main subject in sharp, crisp focus. To create a more attractive exterior design, the lens barrel, hood and cap are meticulously machined from high-grade aluminium.
Exceptional optics
The lens optics incorporates four ED (Extra-low Dispersion) glass and one Super ED (Extra-low Dispersion) glass optical elements to minimize chromatic aberration and prevent color bleeding, not only in the main in-focus area, but also in the surrounding defocused areas. It also features a large-aperture negative meniscus optical element, a biconvex aspherical glass-mold optical element, and a high-refraction glass optical element in the first lens group, to reduce the overall size despite the ultra-wide-angle design, while delivering outstanding imaging performance for sharp, crisp images without fuzziness, even in the peripheral areas.
The lens also features PENTAX original HD Coating - this high-grade, multi-layer coating reduces the average reflectance in the visible spectrum to less than 50 percent, effectively minimizing flare and ghost images even in demanding lighting conditions such as backlighting.
Electromagnetic diaphragm mechanism for high-precision exposure control
This lens incorporates an electromagnetic diaphragm mechanism to assure high-precision exposure control when used in combination with compatible digital SLR cameras. It assures smooth, worry-free video shooting in locations prone to considerable brightness changes, such as a stage with rapidly changing lighting conditions, or a forest with filtering sunrays.
Weather resistant construction
For use in demanding conditions, the lens features a dependable weather-resistant construction. By pairing it with a Pentax weather-resistant digital SLR camera body, you can create a highly dependable, airtight digital imaging system that performs superbly even in the most demanding shooting locations.
Other features
- SP (Super Protect) Coating to keep the lens front surface free of dust or stains
- Serial number assigned to each lens (from 0000001 for the black model; from 1000001 for the silver model
- Built-in motor to drive the AF mechanism for smooth, quiet autofocus operation
- Eight-blade circular diaphragm to produce beautiful light beams with point light sources, while creating a natural, beautiful bokeh (defocus) effect at open and larger apertures
- QFS/A (Quick-Shift Focus System) for instant shift to the manual-focus mode without requiring focus-mode switching operations, after the subject has been captured in focus by the camera’s autofocus system
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