Ricoh has introduced the HD Pentax-D FA 21mm f/2.4ED Limited DC WR lens for Ok-Mount full-frame DSLRs. The corporate says that this ultra-wide prime is optimized for visible traits that may’t be measured in numerical values alone.
Ricoh says that the HD Pentax-D FA 21mm f/2.4ED is able to making pictures look extra real looking, and captures the prevailing ambiance and true-to-life sense of depth in a scene. The 21mm ultra-wide-angle focal size, not beforehand accessible within the FA Restricted collection and what Ricoh says is good for panorama pictures, provides “a brand new perspective of visible expression to the Restricted collection.” When used with PENTAX APS-C cameras, the brand new lens gives a focal size equal to 32mm within the 35mm format.
The lens contains a sturdy, weather-resistant construct that Ricoh says makes it capable of stand up to the pains of difficult photographic situations, citing particularly waterfront areas or within the face of a sudden rainstorm.
The lens makes use of the Restricted collection design, which was developed to supply what Ricoh calls a “distinctive visible expression.” Ricoh says that the method to get to a completed product concerned conducting a collection of picture high quality assessments utilizing an enormous variety of captured pictures, after which these outcomes had been fed again into the design course of, together with varied numerical evaluations utilizing precision measurement instruments.
Construct-wise, the lens is constructed of 11 components in eight teams which incorporates 4 extra-low dispersion (ED) components, one ED aspherical lens factor, and one tremendous ED factor that Ricoh says will reduce chromatic aberration and stop coloration bleeding — not simply in the principle in-focus space, but additionally within the surrounding defocused areas. It additionally contains a large-aperture damaging meniscus optical factor, a biconvex aspherical glass-mold optical factor, and a high-refraction glass optical factor within the first lens group. Ricoh says this design reduces the lens’s general dimension regardless of the ultra-wide-angle design, whereas delivering what it claims to be excellent imaging efficiency for sharp, crisp pictures with out “fuzziness,” even within the peripheral areas.
The lens additionally makes use of Pentax’s authentic Excessive-Definition coating which it says reduces the common reflectance within the seen spectrum to lower than 50%, which interprets to lowered flare and ghosting in pictures even when backlit. The Pentax-D FA 21mm f/2.4ED additionally options an eight-bladed aperture diaphragm.
The autofocus motor is a DC kind that matches contained in the lens barrel, which is a primary for the Restricted collection. Pentax says it gives quiet, easy, exact, and quick autofocus operation — quicker and quieter than what has been accessible up to now.
Under are a couple of pattern pictures offered by Pentax Ricoh: