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The Canon KH21EX5.7 IRSE 1/2" Portable Telephoto ENG Lens is a telephoto portable HDTV production lens within the 1/2-inch image format sector of the HDgc family. This particular lens is intended for producers and broadcast and cable news photographers that have a high priority towards the ability to shoot over long distances combined with reasonably wide angle capture. The KH21ex5.7 offers focal lengths up to 120mm (or 240mm with extender) and a wide-angle of almost 63 degrees horizontal.
The KH21EX5.7 utilizes new technologies and computer-aided design techniques to produce a very wide-angle HDTV lens. It is a design directly responding to the expressed creative desires of broadcasters and HD producers for more versatility in an HD acquisition system. The KH21EX5.7 represents a compromise between the demands for mobility in a handheld HDTV camera system and the high imaging performance requirements for HDTV production. The KH21EX5.7 has a high MTF (Modulation Transfer Function) 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 combines with the high contrast and excellent picture sharpness to produce crisp and clear HD pictures.
By memorizing any two focal lengths, the digital drive can automatically "shuttle" between the two points, moving in either direction.
An angle of view
can be preset in either of two memories
and the lens will zoom to that position
by pushing a simple button. During a
performance, framing preset will reproduce the zoom
position decided upon at the rehearsal. It is easy to repeat
the same zoom as often as you like at the highest speed or
in a preset zoom speed.
A specific zoom speed can be preset in memory and it is possible to repeat the zoom speed as
often as you like by pushing a simple button.
16 bit Resolution Rotary Encoder Device
With the introduction of a 16 bit
resolution Rotary Encoder Device built into the
new enhanced digital drive unit, the lens can
simply be integrated into a virtual digital studio
system without any additions.
In the Box
Canon KH21EX5.7 IRSE 1/2" Portable Telephoto ENG Lens