Description

Canon’s breakthrough technologies and powerful computer-aided design techniques produced the KJ21ex7.6B IRSE, a standard HDTV lens with an excellent performance-cost optimization. In addition, it offers focal lengths of up to 160mm (or 320mm with extender) and a wide field of view of 64.6 degrees. It is a design that directly responds to the expressed creative desires of broadcasters and HD producers for low-cost HD acquisition system. The KJ21ex7.6B IRSE represents a fine compromise between the demands for mobility in a handheld HDTV camera system and the high imaging performance requirements for HDTV production. The requisite optimization strategies to achieve this balance sought a high MTF over the entire image plane, minimization of chromatic aberrations, and maximization of image contrast. Preservation of a high MTF at the wider-angle focal lengths (where scene detail can be particularly high) was a special priority. Relative light distribution was optimized for the more open aperture settings and this uniformity of brightness across the image plane combined with the high contrast and excellent picture sharpness produces vividly clear HD pictures. Contrast was extended by careful control of black reproduction – with optical and mechanical design innovations that substantially reduced flare, veiling glare, and any internal reflections. Tight control of the geometric distortion at wide-angle settings constituted another central design imperative. The lens spectral transmittance characteristic was closely coordinated with that of all of the major portable cameras to ensure adherence to the HDTV colorimetric standards and to additionally support flexible creative control of color reproduction

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