The KH16ex5.7B IRSE standard lens is intended for users whose foremost priority is a lens that delivers a generous range of focal lengths combined with a wide field of view in a lightweight mobile package. It was specifically designed for the Sony HD XDCAM camcorders, which utilize three 1/2-inch 1440-element CCD imagers. It is an important member of the HDgc family in terms of facilitating HD imaging with equivalent operational capabilities as the established 2/3-inch SDTV systems.
Canon’s breakthrough technologies and powerful computer-aided design techniques produced the KH16ex5.7B IRSE, a standard HDTV lens with an excellent performance-cost optimization. In addition, it offers focal lengths of up to 91mm (or 182mm with extender) and a wide field of view of 62.9 degrees. It is a design that directly responds to the expressed creative desires of broadcasters and HD producers for low-cost HD acquisition system.
The KH16ex5.7B IRSE represents a fine compromise between the demands for mobility in a handheld HDTV camera system and the high imaging performance requirements for HDTV production. The requisite optimization strategies to achieve this balance sought a high MTF over the entire image plane, minimization of chromatic aberrations, and maximization of image contrast. Preservation of a high MTF at the wider-angle focal lengths (where scene detail can be particularly high) was a special priority.
Relative light distribution was optimized for the more open aperture settings and this uniformity of brightness across the image plane combined with the high contrast and excellent picture sharpness produces vividly clear HD pictures. Contrast was extended by careful control of black reproduction – with optical and mechanical design innovations that substantially reduced flare, veiling glare, and any internal reflections. Tight control of the 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.
Four significant technologies converge to produce the KH16ex5.7B IRSE portable HD production lens system that has been tailored to partner with today's highest performing HDTV portable cameras and camcorders:
Newly developed optical materials combined with the very latest lens element design innovations and multilayer coatings - that produce an unsurpassed pristine imaging system for the most discerning production team.
Internal Focus - a Canon design innovation that uses a floating optical system to better control chromatic aberrations
Enhanced servo system called Shuttle Shot that adds value-added creativity to handheld acquisition systems
Advanced Drive technology - encompasses servo control that allows the operator to precisely zoom between tow pre-programmed zoom positions
Maximum Zoom speed is 1.2 seconds over entire range
Ergonomic mechanical design that produced this HD lens having the same size and weight as its SDTV predecessor
Compact drive unit is mounted to the lens at a 12.5 degree angle for comfort and balance
Aluminum alloy body for light weight and exceptional durability
All contemporary Canon lenses avoid the use of materials and substances potentially harmful to the environment. Lead has been removed from all optics, and other identified substances such as cadmium, mercury, PBBS etc from all components comprising the composite lens system.
|Product Category||ENG Lens|
|Product Series||KH 16ex5.7 IRSE|
|Object Image Format||1/2 Inch|
|Object Image size||6.97 mm (H) x 3.92 mm (V)|
|Focal Length Range||5.7~92mm|
|Focal Length Range with Extender||11.4~184mm|
|Angular Field of View||At 5.7mm 62.9° (H) x 38.0° (V) At 92mm 4.3° (H) x 2.4° (V)|
|Angular Field of View with Extender||At 11.4mm 34.0° (H) x 19.5° (V) At 184mm 2.1° (H) x 1.2° (V)|
|Maximum Relative Aperture (F-Number)||at 5.7mm~71.6mm 1:1.4 at 92mm (Ramping Characteristic) 1:1.8|
|Maximum Relative Aperture (F-Number) with Extender||at 11.4mm~143.1mm 143.2 at 184mm (Ramping Characterstic) 1:3.6|
|MOD From Front of Lens||0.6 Meter (10mm with Macro)|
|Scene Object Dimensions at MOD||at 5.7mm 67.2 cm x 37.8 cm at 92mm 4.1 cm x 2.3 cm|
|Scene Object Dimensions at MOD with Extender||at 11.4 mm 33.6 cm x 18.9 cm at 184 mm 2.1 cm x 1.2 cm|
|Physical Attributes||163.9mm (6.5in) 106.3mm (4.2in) 196.7mm (7.7in) 3.24lbs (1.47kg)|
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