Four significant technologies converge to produce the KH21ex5.7 portable HD production lens system that has been tailored to partner with todays highest performing HDTV portable cameras and camcorders:
Optical Technologies 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
Digital Technologies new third-generation enhanced digital servo systems using Canon-developed 16-bit optical rotary encoder devices introduce entirely new value-added creativity to handheld acquisition systems
Mechanical Technologies ergonomic mechanical design that produced this HD lens having the same size and weight as its SDTV predecessor
Ecological Design 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.
General Specifications
Object Image Format: 1/2 Inch 16:9 Aspect Ratio Object Image Size (Presented to camera Imagers) : 6.97 mm (H) x 3.92 mm (V) Zoom Ratio : 21 X Focal Length Range : 5.7-120mm, with Extender : 11.4-240mm Angular Field of View : At 5.7mm :62.9° (H) x 38.0° (V), At 120mm: 3.3° (H) x 1.9° (V), With Extender : At 11.4mm 31.5° (H) x 19.0° (V), At 240mm 1.7° (H) x 0.9° (V)
Minimum Object Distance (MOD) (From Front of Lens): 0.8 Meter (10mm with Macro) Scene Object Dimensions at MOD : At 5.7mm 92.2 cm x 51.9 cm, At 120mm 4.3 cm x 2.4 cm , With Extender : At 11.4mm 46.1 cm x 26.0 cm, At 240mm 2.2 cm x 1.2 cm
Maximum Relative Aperture (F-Number) : At 5.7mm-86mm 1 : 1.4 , At 120mm (Ramping Characteristic): 1 : 1.95 , with Extender : At 11.4mm-172mm 1 : 2.8 At 240mm (Ramping Characteristic): 1 : 3.9
