Canon DIGI SUPER 25 XS HDTV Studio Len
Canon Updated: 2007-06-17The DIGI SUPER 25 xs is the flagship of the three HDTV studio lens fleet offered by Canon.
This XJ25x6.8BIE-D lens is the top of the line in HDTV overall performance. It is intended for broadcasters and producers having as their foremost priority the very highest picture quality in a studio high definition lens-camera imaging system. The DIGI SUPER 25x lens is tailored to deliver the most demanding production quality for prime time HD television production.
The XJ25x6.8BIE-D utilized the most contemporary of powerful computer-aided design techniques and breakthrough technologies to implement this superbly performing HDTV lens within an overall package size no larger than current SDTV studio lens. And, it did so while also responding to the expressed creative desires of broadcasters and HD producers - the optical speed is f 1.5 and the wide angle was increased to 6.8mm while the zoom ratio increased to 25x (to maintain the expected telephoto focal length).
ABOUT THIS LENS
The XJ25x6.8BIE-D allied the most state of the art in Canon optical developments with masterful engineering design optimization strategies. One optimization paid close attention to achieving the highest MTF profile over the image plane while simultaneously minimizing chromatic aberrations. Another sought to maintain that high MTF over the total focal range - with the very best characteristics centered on the medium to short focal lengths (wide-angle imagery inherently contains greater detail).
The intimate relationship between picture sharpness and contrast underlay a core optical design strategy - that sought optimization of both. Preservation of a high MTF over the critical 20 - 75 Lp/mm spatial frequency band that is so important to perceived picture sharpness was a key priority here. Contrast was extended by superb control of black reproduction - with optical and mechanical design innovations that substantially reduced flare, veiling glare, and any internal reflections. Similar attention to minimization of ghost images and other highlight-related chromatic distortions caused by strong light sources on-axis and off-axis further extend the operational contrast range of the lens. Uniformity of brightness across the image plane was also carefully controlled which further serves to enhance overall picture clarity.
Finally, the critically important requirement of low geometric distortion at wide-angle settings constituted another central design imperative and an exemplary performance in this area has been achieved by Canon's advanced three-group internal focusing system (which also minimizes alterations of chromatic aberrations during the focusing action).
DIGI SUPER XJ25 6.8BIE-D
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