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The CJ25ex7.6B is the first 4K UHD broadcast lens in its class* with a 25x optical zoom (190mm) on the telephoto end (380mm with the built-in 2x extender). Combined with a 7.6mm wide setting, the CJ25ex7.6B is ideal for a wide range of 4K UHD outside broadcast television productions including live sports, nature, concerts and other live events.
*Among portable lenses for 2/3" 4K cameras with 20x or greater zoom and ENG style shooting capability as of September 12th, 2018
The CJ25ex7.6B 4K UHD broadcast lens was built using our exclusive optical design technology, helping ensure consistent 4K resolving power and high contrast from the center of the screen to the periphery, maintaining 4K optical performance even when the 2x extender is deployed. Zoom fluctuation is controlled through the use of a multi-group movable zoom and aspheric surfaces, and the use of a floating inner focus system helps minimize focus aberrations and improve resolving power at the edges of the screen.
A combination of latest materials, contemporary optical design and multi-layer coatings help produce outstanding 4K imagery, effectively allowing 4K cameras to reach their potential, and expand the possibilities for image expression. Design strategies and optical materials were utilized to help lower the monochromatic and the chromatic optical aberrations to a level consistent with the highest quality 4K portrayal on large screens.
Minimized Chromatic Aberration
Fluorite and UD glass have been generously utilized and optimally arranged for better correction of chromatic aberrations. This helps increase image clarity with less color bleeding or coloring around the outlines, achieving superb color reproduction to the edges of the images.
Reduced Ghosting and Flare
Special coatings and an internal lens barrel designed to prevent reflection, result in clean black reproduction and less ghosting and flaring- sustaining high-tonality images that support High Dynamic Range (HDR) and Wide Color Gamut (WCG).
HDR images offer excellent gradation representation and enhanced realism and dimension including texture for image representation close to the real thing. However, there can be noticeable color bleeding and flare, so HDR shooting requires high optical performance. The CJ25ex7.6B 4K UHD broadcast lens delivers the advanced optical performance that Canon considers essential for a 4K UHD/HDR system lens, enabling shooting of more realistic images.
The portable CJ25ex7.6B 4K UHD broadcast lens features correction data that supports BT.2020, which offers a wider color gamut than the conventional BT.709 broadcasting standard. This enables excellent color reproduction to the corners of the screen when attached to a 4K camera, producing images that support High Dynamic Range (HDR) and Wide Color Gamut (WCG). The CJ25ex7.6B also provides optimized chromatic aberration correction based on BT.2020 correction data, enabling more lifelike high-resolution images with outstanding tonality, realistic texture and depth.
The portable CJ25ex7.6B 4K UHD broadcast lens incorporates a digital drive unit, and the high-performance 16-bit encoder supports communication with compatible 2/3" HDTV/UHDTV cameras equipped with aberration correction functionality, without initializing the lens. Three 20-pin connectors enable high-definition lens output for virtual systems even during full-servo operation. In addition, the low power consumption and the simple display enhance operability.
Improved Startup and Mobility
The drive unit of the CJ25ex7.6B 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.
Digital Correction for Lens Aberrations
Aberration correction functions have increasingly been employed on 2/3" HDTV/UHDTV cameras for broadcast use. The associated data files are immediately transferred to the camera, which implements digital correction for the lens aberrations. The lens also delivers digital positional data for external virtual systems.
Various digital features can be set, adjusted, and operated from the display on the drive unit.
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 new ZDJ-S01 Zoom Demand and the FDJ-S01 Focus Demand, which are currently used by HD equipment.
The drive unit of the CJ25ex7.6B 4K UHD broadcast 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.
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.
Weighing only 4.4 lbs. and measuring 6.8" (W) x 4.5" (H) x8.8" (L), the portable CJ25ex7.6B 4K UHD broadcast lens delivers the optical performance to support 4K cameras in a compact, lightweight body with the durability of a conventional HD lens.
Designed to satisfy professionals with its high-level combination of excellent specifications, enhanced optical performance, and outstanding usability, the lens is ideal for on-the-shoulder shooting and interviews, and offers the high mobility demanded of cameras in the reporting and documentary fields.
The ergonomically designed grip offers an excellent feel during operation, and was designed to fit comfortably in the hand, easing strain on camera operators shooting for long hours on the shoulder.
Object Image Format
Focal Length Range
Focal Length Range with Extender
Angular Field of View
2.89° x 1.63° at 190 mm
Angular Field of View with Extender
1.45° x 0.81° at 380 mm (with 2x Extender)
Maximum Relative Aperture (F-Number)
1:2.9 at 190 mm
Maximum Relative Aperture (F-Number) with Extender
1:5.8 at 380 mm (with 2x Extender)
MOD From Front of Lens
Scene Object Dimensions at MOD
3.9 x 2.2 cm at 190 mm
Scene Object Dimensions at MOD with Extender
2.0 x 1.1 cm at 380 mm (with 2x Extender)
Canon Broadcast Lenses
Learn about Canon's lineup of Broadcast lenses.
Today, large format lens-camera systems have been adopted in many broadcast television productions and producers, directors, and camera operators have now become both attached to, and skilled in, the cinematic imagery and practices supported by these systems. In particular, the “rack focus” is much used in movie and episodic television dramas. This entails a subtle change in depth of field that reveals some new detail (can be an item or another human subject) in a scene – by careful manual operation of the lens focus control. Operational implementation involves changing the focus of the lens during a continuous shot – and this can be small or large changes of focus. If the focus is shallow, then the technique becomes more noticeable. It does demand precision control over focus accuracy.
Very wide rotation angles – typically 270 degrees or greater (from MOD to Infinity focus extremes) – has long been established in the cine lenses (both primes and zooms) used in the motion picture film world.
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.
*Among portable lenses for 2/3" 4K cameras with 20x or greater zoom and ENG style shooting capability as of September 13, 2018.
† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.