The KH19x6.7 KTS is a cost-effective
new long focal length portable 1/2-inch HDTV production
lens offered by Canon.
This particular lens is intended
for producers and broadcasters having as their
foremost priority an HD acquisition system of
modest cost – possibly to support high definition
ENG or a diversity of professional, business and
industrial production applications.
This lens is intended to work in
conjunction with the new ½-inch image format
HDTV cameras and camcorders that are emerging
as low-cost HD acquisition systems for newsgathering,
point of view, and other special applications.
The KH19x6.7 KTS has an excellent sensitivity
of f 1.6 over an almost 15x zoom range (falling
modestly to f 2.1 at full telephoto). It has a
generous 55-degree horizontal field of view and
weighs in a low 2.8 lbs. This lens is anticipated
to be a superb workhorse that can address a wide
range of field production projects.
The design optimization strategies
sought a balanced MTF profile over the entire
image plane at an F4.0 aperture setting. Relative
light distribution was optimized for F2.8 and
above and this 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.