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CJ15ex4.3B IASE S

4K UHDxs Portable Lenses

Item Code: 4102C001

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4K Optical Performance and Improved HD Imaging

The portable CJ15ex4.3B 4K UHD lens was developed using our exclusive optical design technology to achieve superb optical performance, with 4K resolving power and high contrast from the center of the screen to the edges. As part of our UHDxs family, this lens represents Canon’s highest class of broadcast lens offerings. In addition to capturing impressive 4K content, the CJ15ex4.3B lens will significantly enhance current HDTV optical imaging performance while potentially future-proofing for the longer term, making it ideal for those seeking a new lens for contemporary HDTV production – while also anticipating a future shift to 4K production. 

High index optical glass materials, each having unique dispersion characteristics, help minimize chromatic aberrations and geometric distortion. Lens element surface accuracy has been improved significantly over HDTV lenses contributing to the enhanced Modulation Transfer Function (MTF) performance required of 4K imagery. Multi-layer optical coatings combined with strategic deposition processes help ensure a deep black reproduction that is central to HDR imaging.

Minimized Chromatic Aberration

An optimized arrangement of fluorite and UD glass help minimize chromatic aberration, increasing image clarity with reduced color fringing on edges.

Air Sphere Coating (ASC)

The CJ15ex4.3B is the first Canon portable 4K lens to utilize Air Sphere Coating (ASC), which reduces ghosting and flaring intensity to improve HDR shooting, resulting in clean black reproduction and high-tonality images that support HDR.

Extreme Wide Angle 4.3mm with Class Leading 15x1 Zoom and Built-in 2x Extender
The CJ15ex4.3B 4K UHD wide-angle portable lens offers the world's shortest focal length of 4.3mm*. This makes it possible to create images with extreme 96.3 degree wide angles of view, with the shortest focal length for a 2/3" 4K lens. Additionally, this lens offers the longest telephoto performance in its class with a 15x zoom* ratio enabling shots up to 65mm, and for even greater flexibility the built-in 2x extender can increase that further to a super telephoto 130mm focal length.

1 Among compatible 2/3-inch wide-angle 4K broadcast lenses available as of September 5th, 2019.

Compact and Lightweight
Weighing only 4.8 lbs. and measuring 6.4” (W) x 4.2” (H) x 9.8” (L), the CJ15ex4.3B 4K UHD portable lens was engineered to be similar in size to our 2/3" HD lenses, while delivering 4K performance and offering the mobility and durability demanded in the sports, reporting and documentary fields.

The form factor creates a user-friendly design, including an ergonomic grip design for a comfortable feel during operation, helping to reduce fatigue and make it easy to move the camera about. The center of gravity is close to the mount, lessening strain on the hands and elbows of the camera operator.

BT.2020 and HDR/WCG Support
TheCJ15ex4.3B 4K UHD portable lens features correction data that supports BT.2020, which offers a wider color gamut than the conventional BT.709 broadcasting standard. This enables exceptional color reproduction to the edges of the screen when attached to a 4K camera. The CJ15ex4.3B also provides optimized chromatic aberration correction based on BT.2020 correction data, enabling more lifelike high-resolution video shooting with outstanding tonality, realistic texture and depth.


Compatibility with HD Demands 
This feature allows for compatibility with HD demands used for broadcasting. Operators can continue using the zoom/focus motorized accessories and servo models they currently use with HD equipment, as well as Canon’s ZDJ-S01 Zoom Demand and FDJ-S01 Focus Demand. These new zoom and focus demands are equipped with the flexibility necessary to meet diverse user needs when shooting in 4K, while offering simple operability in a compact design.

Advanced Digital Drive Unit

The CJ15ex4.3B 4K UHD portable 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.

Improved Startup and Mobility

The drive unit of the CJ15ex4.3B 4K UHD lens can output accurate lens position data from the moment the power is turned on and does not require initialization, contributing to a 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

Associated data files are immediately transferred to the camera without lens initialization, which implements digital correction for the lens aberrations. The lens also delivers digital positional data for external virtual systems.

Advanced Virtual Operability and Precise Virtual Image Expression

The drive unit of the CJ15ex4.3B 4K UHD lens uses three 20-pin connectors. One of these 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.

Convenient Digital Functions
The Canon drive unit integrates a variety of operations, stored digitally, that can be manipulated using the display.

Shuttle Shot
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 to an object.

Frame Preset
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.

Speed Preset
A specific zoom speed can be preset 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 the creation of stable images, particularly with slow zooms.




Product Category

ENG Lens

Product Series


Image Composition

Object Image Format

2/3 inch

Aspect Ratio


Zoom Ratio


Focal Length Range

4.3 ~ 65mm

Angular Field of View

96.3° x 64.2° at 4.3 mm
8.4° x 4.8° at 65 mm

Optical Brightness

Maximum Relative Aperture (F-Number)

1:1.8 at 4.3 - 40 mm
1:2.9 at 65 mm

Scene Composition

MOD From Front of Lens

0.30 Meters (10 mm with Macro)

Scene Object Dimensions at MOD

76.1 x 42.8 cm at 4.3 mm
4.9 x 2.8 cm at 65 mm

Physical Attributes


6.4in (163.0mm)


4.2in (107.6mm)


9.6in (249.6mm)


4.8 lbs. (2.19 kg)




2019 Best of Show

The CJ15ex4.3B received the Best of Show Award from TV Technology at NAB 2019.

White Papers

Augmented Creative Control: Innovations in Focus Demand and Zoom Demand Controllers for 4K UHD Long Zoom Field 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.
Role of the 2/3-inch Image Format in 4K UHD Production
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.
Lens Strategies for the era of 4K UHD Digital Motion Imaging
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.

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White Papers

Built-In Image Stabilization Empowers 4K UHD Portable Lens for Documentary Production

12.2 MB

Role of the 2/3-inch Image Format in 4K UHD Production

19.1 MB

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Canon Broadcast Lenses

Learn about Canon's lineup of Broadcast lenses...

Introducing the Canon CJ15ex4.3B Wide Angle Broadcast Lenss

Delivering the high optical performance of Canon’s UHDxs series, the CJ15ex4.3B broadcast lens possesses an industry-leading wide-focal length of 4.3mm and best-in-class maximum focal length of 65mm (130mm with built-in 2X extender), making it ideal for producing high-quality video for a variety of needs including sports broadcasting and electronic newsgathering. Through the optimal placement of fluorite, UD and Super UD lenses in a multi-group optical configuration developed by Canon, the CJ15ex4.3B possesses excellent correction of situations such as color bleeding and chromatic aberration. In addition, Canon’s proprietary Air Sphere Coating (ASC) helps reduce flaring and ghosting and provides great visual expression with rich gradation, which is ideal for HDR and WCG shooting. The CJ15ex4.3B is the first portable broadcast lens to feature Air Sphere Coating, which originated with Canon’s EF-mount photography lenses.

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† Prices and specifications subject to change without notice. Actual prices are determined by individual dealers and may vary.

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