CANON CJ20eX7.8B IASE S 4K

4K B4 2/3″ broadcast lens with extender

General Specifications

• Mount: B4 bayonet, 2/3″ image format.

• Zoom Ratio: 20×.

• Focal Length:

  • Without extender: 7.8 mm to 156 mm.

  • With built-in 2× extender: 15.6 mm to 312 mm.

• Maximum Relative Aperture:

  • Without extender: f/1.8 at 7.8–108 mm; f/2.6 at 156 mm.

  • With extender: f/3.6 at 15.6–216 mm; f/5.2 at 312 mm.

• Minimum Object Distance (MOD): 0.80 m specification.

• Field of View (angular):

  • At 7.8 mm: approx. 63.2° × 38.2°.

  • At 156 mm: approx. 3.5° × 2.0°.

  • With extender at 15.6 mm: approx. 34.2° × 19.6°.

  • With extender at 312 mm: approx. 1.8° × 1.0°.

• Physical dimensions & weight:

  • Approx. size: Width 169.9 mm × Height 114.4 mm × Length 230 mm.

  • Weight: approx. 2.18 kg.

Features & Additional Details from the Manual

• The lens is designed for 4K-UHD production, even though it is for 2/3″ sensors – the optical design uses high refractive index glass materials to minimise chromatic aberration and geometric distortion. 

• Built-in 2× extender maintains optical performance compatible with 4K even when extender is engaged.

• Digital drive unit compatible with the IASE S family: includes high-precision 16-bit encoders for zoom/focus/iris, outputting metadata for virtual/virtual-studio use.

• Macro capability: from one specification there is a “10 mm with macro” mention — likely referring to front of lens to object though this is less clearly defined.

Use & Suitability

• Ideal for ENG/EFP shoulder-mounted use thanks to its relatively light weight (for a 4K capable broadcast zoom) and compact dimensions.

• The combination of wide zoom range (7.8-156mm or 15.6-312mm with extender) and support for advanced broadcast control (servo zoom, focus, metadata output) makes it suitable for news, documentaries, sports, and live production scenarios.