Description

Canon used breakthrough technologies and powerful computer-aided design techniques to produce the KT20x5B KRS, a multipurpose HD lens offering focal lengths of up to 100mm while maintaining a horizontal wide angle of 52 degrees. In addition, it is combined with an exceptionally high sensitivity (F1.4 maximum aperture), this is a lens that can be utilized in an unusually broad range of shooting situations at an attractive price point. It is a design directly responding to the expressed creative desires of broadcasters and HD producers for low-cost HD POV and special-application acquisition systems, while also facilitating the corporate, business and industrial sectors to painlessly transition from SD to HD. The KT20x5B KRS 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. 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 to 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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