The HJ17ex7.6B is a cost-effective new 2/3-inch portable HD lens specifically intended to support the emerging industry interest in high definition electronic newsgathering.
It is a key new member of a family of HD portable lenses intended to support the broadening of HDTV production. This particular lens is intended for producers and broadcasters having as their foremost priority an affordable lens-camera system that offers performance tailored for HDTV newsgathering.
The HJ17ex7.6B utilized breakthrough technologies and powerful computer-aided design techniques to produce an HDTV lens with a generous wide-angle field of view in a modest 3.6 lb package. The optional flexibility of Canon’s Crossover aspect ratio switching system makes it a superb performer for both 16:9 widescreen and standard 4:3 image formats.
ABOUT THIS LENS
The HJ17ex7.6B represents an innovative solution to the pressing demands of broadcast newsgathering for low-weight and high-mobility and the exacting performance requirements for HDTV acquisition. The magnesium alloy body produced the desired low weight attendant with high durability. Superb optimization strategies helped achieve the sought-for performance – having a high sensitivity, an excellent MTF profile over the entire image plane, minimization of chromatic aberrations, and maximization of image contrast. The maximum aperture of f 1.8 makes this lens eminently suited to low-light newsgathering acquisition.
Uniformity of brightness across the image plane combines with the high contrast and excellent picture sharpness to produce vividly clear HD pictures. 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.
Tight control of the critically important 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.