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Aspheric lens elements are deployed to a greater extent in the larger diameter elements, contributing to far greater control over geometric distortion and aberrations - especially at the very wide angle settings. Three-part internal focus helps reduce changes in aberrations when focusing to different object distances, while the 170° rotation angle facilitates tight control over any tendency for focus breathing. New, more powerful computer design tools facilitated a greater degree of optimization of multiple optical variables in the lens design.
Weighing only 4.81 lbs. and measuring 6.69" (W) x 4.50" (H) x 9.06" (L), the portable CJ20ex7.8B 4K UHD lens is similar in size to our 2/3" HD lenses, while delivering 4K performance. The same shooting style as that of existing 2/3" HD lenses can be carried over. The center of gravity is close to the mount, lessening strain on the hands and elbows of the camera operator. The ergonomic form factor creates a user-friendly design, including an ergonomic grip design for a comfortable feel, helps to reduce fatigue and make it easy to move the camera about. The new lens is sure to satisfy professionals with its high-level combination of excellent specifications, enhanced optical performance, and outstanding usability.
This feature allows for compatibility with a broadcast-use HD demand. It enables the use of the zoom and focus electrical drive system accessories (such as the ZSC-300D and FPD-400D) which are currently used by HD equipment.
Improved Startup and Mobility
The drive unit of the CJ20ex7.8B 4K UHD lens can output accurate lens position data from the moment the power is turned on and does not require initialization, contributing to the quick start when shooting. This is possible thanks to the drive unit's 16-bit absolute value encoder. Eliminating initialization of the encoder at power-on simplifies calibration when composing virtual and live-action images, and helps to create more accurate composites.
Aberration Correction and Virtual Functions Enabled without Lens Initialization
Aberration correction functions have often been employed on 2/3" HDTV cameras for broadcast use. The drive unit of the CJ20ex7.8B 4K UHD lens can output accurate lens position data from the moment the power is turned on and does not require initialization, contributing to the quick start when shooting.
Advanced Virtual Operability and Precise Virtual Image Expression
The drive unit of the CJ20ex7.8B 4K UHD lens uses three 20-pin connectors. One of these connectors outputs 16 bit high precision lens positional data, allowing for output even while the zoom and focus servo controllers are in use. This high-performance encoder helps simplify calibration when composing virtual and live-action images, thus resulting in more accurate composites.
Simple Display Operations
Canon's unique display-based functions help a variety of operations. We have listened to our customers, and a simplified mode (Basic Mode) makes for easier operation.
The Canon drive unit integrates a variety of operations, stored digitally, that can be manipulated using the display.
By memorizing any two focal lengths, the Canon drive unit can automatically "shuttle" between two points, moving in either direction. As an example, this function is effective for shots in which an operator wants to start from a wide angle and then zoom in rapidly on to an object.
An angle of view can be preset in either of two memories and the lens will zoom at the highest speed, or in a preset zoom speed, to the pre-set position with the push of a simple button. As an example, this function can be effective for situations such as interview programs, where it is necessary to switch between bust shot and wide shot.
A specific zoom speed can be preset in memory making it possible to repeat the zoom speed as often as you like with the push of a simple button. Using a preset speed when zooming in and zooming out contributes to help create stable images, particularly with slow zooms.
Object Image Format
Focal Length Range
Focal Length Range with Extender
Angular Field of View
3.5° × 2.0° at 156mm
Angular Field of View with Extender
Maximum Relative Aperture (F-Number)
Maximum Relative Aperture (F-Number) with Extender
MOD From Front of Lens
Scene Object Dimensions at MOD
Scene Object Dimensions at MOD with Extender
This paper is intended to provide a background to the emergence of 2/3-inch lens-camera systems for 4K UHD production and the optical performance expectations of associated 4K lenses. The paper will review Canon’s involvement in the development of those lenses and will describe our initial 4K UHD lens family and the associated design strategies to achieve this impressive level of optical performance. The paper will explain the unprecedented strategy of introducing two categories within this new 4K UHD lens family – namely, 4K and 4K PREMIUM. The distinct performance difference between the two reflects Canon’s recognition that different 4K program genres will require different levels of overall cost / performance.
It was probably inevitable that broadcasters would begin to explore the possibilities of 4K UHD for the globally popular world of outside broadcast sports coverage; and indeed, recent years have seen a great deal of related experimental projects. The 4K UHD lens issue soon surfaced as the limitations of presently available Super 35mm zoom lenses quickly became apparent.
† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.