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KJ17ex7.7B II

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KJ17X77BIASE
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  • Optical Technologies
  • Digital Technologies
  • Optomechanical Technologies
  • Ecological Design
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Overview

The KJ17ex7.7B is a second generation 2/3-inch HDgc portable HD lens. The design reflects design refinements to the first generation line of HDgc lenses originally introduced in 2006.

The HDgc line of lenses had been specifically developed to achieve a price performance ratio that was commensurate with cost-effective HD camcorders introduced by all major camera manufacturers for HDTV newsgathering, HD reality shows, and other lower-budget HD productions. 

The KJ17ex7.7B is a portable HDTV production lens within the 2/3-inch image format sector of the HDgc family. This particular lens is intended for users whose foremost priority is an affordable HD lens that delivers a generous range of focal lengths combined with a wide field of view in a lightweight mobile package. 

The imaging performance of KJ17ex7.7B has been significantly advanced by mobilizing the most contemporary of optical glasses, optical coating materials and processes, and powerful optical design tools. Customer feedback also spurred a total redesign of the digital drive unit that further optimized both the ergonomic aspects and the performance of the digital electronic control of zoom, iris, and focus.

The wide 7.7 mm focal length translates to a 63.9 degree horizontal angle of view for the 16:9 HD image format. Combined with a focal range that has been extended to now cover a range from 7.7mm to 131mm (and 262mm with extender) this lens offers unsurpassed operational capabilities in a compact package weighing less than 3.5lbs. Focus breathing has also been significantly reduced over the predecessor lens.

ABOUT THIS LENS

The KJ17ex7.7B represents a 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, 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.

 

Features

Four significant technologies converged to produce the KJ17ex7.7B portable HD ENG lens system that has been designed to partner with the most contemporary 2/3-inch HD production cameras:

Optical Technologies

  • The optical glass material used in this lens with unique dispersion characteristics, allow improvement in chromatic and geometric distortion. Lens element surface accuracy has been improved two-fold over those in the earlier HDgc lenses contributing to the improved MTF performance

  • Multilayer Optical Coatings combined with new deposition processes produce an improved optical contrast ratio

  • Three-part Internal Focus is a Canon design innovation that reduces changes in aberrations when focusing to different object distances while also exercising improved control over any tendency for focus breathing

  • More powerful computer design tools facilitated a greater degree of optimization of multiple optical variables in the lens design

Digital Technologies

Fourth-generation digital servo systems further empowers the camera operator in terms of operational creativity:

  • Enhanced Digital Drive technology based upon a software platform provides precision microcomputer control of the three servo systems for zoom, iris and focus while also facilitating developments in lens-camera correction of lateral chromatic aberration

  • Unique Information Display and extended memory within the digital drive unit extends user-defined digital functionality

  • Canon's patented Micro Roof mirror Array (MRA) technology underlies the unique miniature 16-bit rotary encoders that are used for each of the zoom, iris, and focus position detection (each with a positional accuracy of 0.1 micrometer)

  • Dynamic Zoom Speed Range can be adjusted from 0.5 seconds to 5 minutes (from wide to telephoto extremes)

Optomechanical Technologies
Extensive use of 3D CAD-CAM design facilitated a design that paid high attention to operator comfort and attendant lowering of fatigue during protracted shooting:

  • Digital Drive Unit was designed to take into account the curved human hand that encompasses the unit with a view of shaping the unit for greater comfort and to better facilitate the actuation of lens controls. The unit shape also provides a wider separation that allows the other hand to more easily adjust the focus control. Finally, the drive unit was narrowed and its mounting angle on the lens set to allow the operator's elbow to settle close to the body thus providing an important reduction in fatigue when operating a shoulder mounted lens-camera system

  • Special Magnesium alloy body for light weight and exceptional durability

  • Computer simulation of the optomechanical design allowed examination of optimized anti-reflection internal barrel coatings, and structural techniques (light blocking grooves and knife edges) that produced greater control over harmful light reflections within the lens barrel that can be stimulated by strong light sources

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 from all components comprising the composite lens system.

Technical Specifications

Model Name KJ10ex4.5B KJ17ex7.7B II
Focal Length 1x 4.5-45mm 7.7-131mm
2x 9-90mm 15.4-262mm
Zoom Ratio 10x 17x
Maximum Relative Aperture 1x 1:1.8 (at 4.5-.4.5mm)
1:2.35 (at 45mm)
1:1.8 (at 7.7-103mm)
1:2.3 (at 131mm)
2x 1:3.6 (at 9-68.9mm)
1:4.7 (at 90mm)
1:3.6 (at 15.4-206mm)
1:4.6 (at 262mm)
Image Format Dia. 11mm (9.6 x 5.4 mm)
Angula Field of View Wide 1x 93.7°x61.9° 63.9°x38.6°
2x 56.1°x33.4° 34.6°x19.9°
Tele 1x 12.2°x6.9° 4.2°x2.4°
2x 6.1°x3.4° 2.1°x1.2°
Minimum Object Distance (M.O.D.) (Macro: 10mm from the lens vertex) 0.3m 0.6m
Object Dimensions at M.O.D. Wide 1x 74.1x41.7cm 67.3x37.9cm
2x 37.0x20.8cm 33.7x19.0cm
Tele 1x 6.4x3.6cm 4.2x2.4cm
2x 3.2x1.8cm 2.1x1.2cm
Flange Back 48mm (in air)
Thread for Filters 127mm P0.75
(Hood Unit Thread Size)
82mm P0.75
(Lens Barrel Thread Size)
Zoom Speed for Full Range Max. 0.5s ± 0.2s
Focus Speed for Full Range 1.3s± 0.3s
Iris Control from camera
Mount B4
Power Source DC12V (DC10 ~ 17V)
Current Consumption R Type Max. 300mA
A Type Max. 500mA
Operating Temperature Temperature: -20°C to + 45°C
Humidity: 5% to 95% RH (no condensation)
Mass without Hood IRSE S Approx. 1.83kg Approx. 1.65kg
IASE S Approx. 1.91kg Approx. 1.73kg

Informational Documents

File Name

Broadcast & Cinema Lens Catalog - Fall 2024

Date

09.16.24

File Size

85.9 MB

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