01.04.2010 12:05 PM
Originally featured on BroadcastEngineering.com
Canon expands 2/3in ENG lens family
Canon has added a new telephoto model to its expanding line of introduced HDgc portable HD lenses that are targeted at high-definition newsgathering and budget-conscious HD productions. These lens families include 2/3in, 1/2in and 1/3in HD image format sizes.
The new KJ22ex7.6B telephoto is the second in this 2/3in family of lenses, joining the KJ17ex7.7B portable 2/3in HD zoom lens (introduced at NAB 2009). These lenses retain the magnesium opto-mechanical design of Canon’s higher-end lenses.
The KJ22ex7.6B is designed as a multipurpose telephoto lens. It offers a generous range of focal lengths while also providing a modest wide angle of almost 65 degrees in the 16:9 HD image format. This feature provides camera operators with ﬂexible image framing options, especially for outdoor shooting. Additional design optimizations include large diameter aspherical lens elements that contribute to a better control of chromatic aberration, geometric distortion and corner resolution. Curvature of field and chromatic aberrations have also been reduced by use of special optical materials that include Fluorite and Hi-UD glasses. Extensive computer optimization of both the optical and optomechanical designs contributed to achieving a high-performing telephoto lens within a compact and lightweight body.
The new KJ22ex7.6B includes redesigned digital drive unit for greater operator comfort and convenience. The unit enables users to program precise and repeatable settings into the KJ22ex7.6B lens for zoom position and speed, focus, and iris. An information display built into the unit makes precise customization quick and convenient. Improvements include widening the spacing between the focus ring and the unit so operators are less likely to accidentally change settings while manipulating the focus control.
Canon has incorporated a new software platform within the Digital Drive unit that allows the KJ22ex7.6B to work with the different chromatic aberration correction systems developed by various camera manufacturers.