05.02.2011 08:00 AM
Canon focuses on ENG with 20x HD zoom lens with built-in 2x extender
The KJ20x8.2B is the newest member of Canon’s HDgc series of cost-effective portable HD zoom lenses, complete with optical performance and operational features and a redesigned advanced drive unit.
The new lens includes a built-in 2x extender, a feature previously seen only on higher-end HD lenses. This gives ENG shooters flexibility when framing subjects. The J20x8.2B is also Canon’s widest (8.2 mm) lens in the affordable 20x zoom class, and provides a generous range of focal lengths, particularly when combined with its built-in 2x extender expanding its 8.2mm-164mm focal length to 16.4mm-328mm.
Canon first introduced its HDgc series of HD portable lenses five years ago to provide high optical performance at competitive prices for the then-emerging generation of lower-cost portable HD video cameras designed for ENG and other types of programming. The HDgc product line has since grown into a broad range of portable HD lenses engineered to meet a wide range of production applications for lower-cost HD cameras and camcorders having either 2/3in, 1/2in or 1/3in imagers.
The company said the new lens has minimized axial and lateral chromatic aberrations, coma aberrations and geometric distortion. New optical materials and multilayer optical coatings used for the KJ20x8.2B effectively attenuate optical artifacts such as ghosting, flare and veiling glare that might be stimulated by strong light sources (for example, sun in daytime and car headlights at nighttime).
The KJ20x8.2B also exhibits a high modulation transfer function (MTF) at picture center that is also well controlled out to picture extremities. This high MTF is well sustained even with operational adjustments of focal length and object distance. The KJ20x8.2B’s optical performance is well-balanced for both near and distant subjects, and its rendering of distant subjects at wide angles surpasses previously available lenses in this price range. The new lens features an enhanced macro function that effectively reduces the minimum object distance (from the front of the lens) to only 10mm.
The lens also features Canon’s latest improvements in Advanced Drive Unit (ADU) technology. On the new KJ20x8.2B, the ADU includes Shuttle Shot, a Canon-exclusive technology that enhances production capabilities. At the touch of a button, Shuttle Shot allows the operator to rapidly zoom back and forth between any two positions. Shuttle Shot can be used to zoom to the telephoto position to check focus and almost instantly return to the original position, or users can shuttle between any two zoom-positions at any time.
The KJ20x8.2B’s zoom can travel end-to-end in as little as one second, an improvement over the speed of previous models; although faster, new noise suppression on the servomotor inside the ADU ensures quiet operation.
The new ADU also features an ergonomically redesigned, tilted shape for user comfort, convenience and balance. The operator’s tactile connection with the lens is enhanced by a ribbed surface on the bottom of the drive unit to ensure a firmer grip and better overall operational control. A new grip support allows users to securely grasp the drive unit without inadvertently pressing on the VTR or Shuttle Shot buttons.