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ABOUT THIS LENS
The KJ17ex7.7B represents a new degree of optimization in meeting the demands for mobility in a handheld HDTV camera system and achieving the imaging quality sought in HDTV broadcast news acquisition while also essentially maintaining the price level of the original HDgc. The maximum relative aperture is F1.9 which, combined with the typically F-10/11 sensitivity specifications of the contemporary HD ENG cameras, ensures excellent video pictures in very low light environments. The image performance strategies of this new lens sought a tighter control of MTF across the entire image plane and with operational variations of zoom, iris, and focus. Minimization of monochromatic and chromatic aberrations and further maximization of image contrast combine with the improved MTF to produce superb picture sharpness.
Relative light distribution over the mid to long focal lengths is better controlled and this better uniformity of brightness across the image plane combines with the higher contrast and higher MTF to produce sharp clear HD pictures. Contrast was enhanced by excellent control of black reproduction using new multilayer anti-reflective optical coatings and new optomechanical design innovations that significantly reduced flare, veiling glare, and any internal reflections.
The lens spectral transmittance characteristic was closely coordinated with that of all of the major portable HD cameras to ensure adherence to the international HDTV colorimetric standard.
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