When used for distant topics equivalent to landscapes, the lens assures strong, uniform picture rendition throughout the picture area. By additional closing the aperture down, it delivers sharp, clear, high-resolution photographs, even on the edges. Its optical traits change for close-range pictures. At open aperture, it supplies a light bokeh (defocused) impact within the background whereas capturing the principle topic in sharp, crisp focus. This allows the topic to face out in opposition to a defocused background, with the exaggerated perspective typical of ultra-wide-angle lenses. At a minimal focusing distance of seven inches (18 centimeters), it could possibly create a wide range of visible expressions, relying on the topic being captured.
To attain a lovely exterior design, the lens barrel, hood and cap have been meticulously machined from high-grade aluminum. In each method, this lens is an distinctive imaging device that can carry larger pleasure and inspiration to pictures.
2. Distinctive optics incorporating the newest optical applied sciences
The lens optics incorporate a complete of 5 glass components: 4 ED (Additional-low Dispersion) glass components—together with one ED aspherical lens—and one Tremendous ED (Additional-low Dispersion) glass optical factor to reduce chromatic aberration and forestall shade bleeding, not solely in the principle in-focus space, but additionally within the surrounding defocused areas. It additionally contains a large-aperture destructive meniscus optical factor, a biconvex aspherical glass-mold optical factor and a high- refraction glass optical factor within the first lens group; this design reduces the lens’s general dimension regardless of the ultra-wide-angle design, whereas delivering excellent imaging efficiency for sharp, crisp photographs with out fuzziness, even within the peripheral areas.
The lens additionally options PENTAX-original Excessive-Definition (HD) Coating. In contrast with typical multi-layer coatings, this high-grade, multi-layer coating reduces the typical reflectance within the seen spectrum to lower than 50 %, successfully minimizing flare and ghost photographs even in demanding lighting circumstances equivalent to backlighting.
3. Inside lens motor AF
The lens contains a DC motor contained in the lens barrel—a primary for the Restricted D FA Sequence—to guarantee easy, quiet, high-precision, high-speed autofocus operation. This focusing mechanism supplies a quieter drive sound and smoother operation than conventional physique autofocus.
4. Electromagnetic diaphragm mechanism for high-precision publicity management
This lens incorporates the KAF4 mount, with an electromagnetic diaphragm mechanism to guarantee high-precision publicity management when utilized in mixture with suitable digital SLR cameras. It assures easy, worry-free video capturing in areas susceptible to dramatic brightness modifications, equivalent to a stage with quickly altering lighting circumstances, or a forest with filtered daylight.
Electromagnetic diaphragm management is on the market together with the PENTAX Ok-3 Mark III, PENTAX Ok-3 II, PENTAX Ok-3, PENTAX KP, PENTAX Ok-70, PENTAX Ok-50, PENTAX Ok-S2, PENTAX Ok-S1, PENTAX Ok-1 Mark II and PENTAX Ok-1 digital camera our bodies. Ricoh advises customers to improve the digital camera’s firmware to the newest model to correctly function the electromagnetic diaphragm mechanism.