Canon CJ20EX7.8B 4K UHD
The Canon CJ20EX7.8B is a 7.8–156mm f/1.8 cinema lens designed for B4 mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Canon CJ20EX7.8B 4K UHD
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Lens Overview — Canon CJ20EX7.8B
Key Features — Canon CJ20EX7.8B
20x Optical Zoom Range: Covers 7.8mm to 156mm in a single lens, reducing the need for lens swaps across a wide range of broadcast shooting scenarios.
f/1.8 Maximum Aperture: Wide maximum aperture delivers strong light-gathering performance for studio, live event, and low-light broadcast environments.
4K UHD Optical Performance: Optics are engineered to resolve 4K UHD detail, keeping the lens viable as broadcast facilities transition to higher-resolution workflows.
Optical Image Stabilization: Built-in optical stabilization compensates for camera movement during handheld or shoulder-mounted operation, helping maintain a steady image.
B4 Lens Mount: Industry-standard broadcast mount ensures compatibility with professional ENG and studio cameras from Canon, Sony, and Panasonic.
Wide-Angle 7.8mm Start: The short end of the zoom provides expansive wide-angle coverage suited to tight studio spaces or immersive field coverage.
Lens Specifications — Canon CJ20EX7.8B
| Spec | Detail |
|---|---|
| Use Cases | Video / Cinematography, Studio, Event |
| Lens Type | Zoom |
| Format | Other |
| Zoom/Prime | Zoom |
| Focal Length | 7.8–156mm |
| Maximum Aperture | f/1.8 |
| Camera System | Cinema / Video |
| Lens Mount | B4 |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | Optical |
| Weight | 2.19kg |
Description — Canon CJ20EX7.8B
The Canon CJ20EX7.8B is a professional broadcast zoom lens built around a 7.8mm to 156mm focal length range — delivering a 20x zoom ratio that covers wide-angle through long telephoto in a single, production-ready package. Featuring a B4 mount, it integrates seamlessly into professional broadcast and video format camera systems. The f/1.8 maximum aperture ensures reliable performance even in challenging lighting environments, while optical image stabilization helps keep footage steady during handheld or shoulder-mount operation.
Focus is entirely manual, putting control directly in the hands of the operator or focus puller, which is well-suited to scripted and live broadcast workflows alike. The lens is classified under the Video and Broadcast Format lens category and weighs 2.19 kg, making it a substantial but purpose-built tool for professional production rigs. Whether deployed in a studio or out in the field, the CJ20EX7.8B's combination of wide zoom range, fast maximum aperture, and optical stabilization makes it a capable single-lens solution for broadcast cinematographers.
Pros — Canon CJ20EX7.8B
- ✓Wide 7.8mm to 156mm focal length range provides exceptional versatility in a single zoom lens
- ✓Maximum aperture of f/1.8 offers strong light-gathering performance for demanding shooting conditions
- ✓Optical image stabilization helps maintain a steady image during handheld or mobile operation
Cons — Canon CJ20EX7.8B
- ✗Manual focus only — no autofocus support, which may require a dedicated focus puller in fast-paced productions
- ✗At 2.19 kg, the lens adds meaningful weight to a camera rig and may require additional support for extended use
- ✗No filter thread size listed, which may complicate the use of screw-on filtration
Videos — Canon CJ20EX7.8B
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