Requires a mechanical gear attachment on the focus ring for studio configurations. 6. Troubleshooting and Maintenance
Proper installation is critical for safety and image quality. Follow these steps exactly.
Yes, with the correct adapter. You will need a B4 to [your mount] adapter . However, due to the large image circle, there will be a significant crop factor (often 2x to 3x), making your 9mm wide-angle appear more like a 27mm normal lens. The lens is heavy, so support the lens, not your camera body.
Locate the primary positioning pin on the rear flange of the Canon lens. Align this pin exactly with the top-center indexing slot of the camera's B4 mount. canon yj18x9b4 manual top
The Canon YJ18x9B4 is a high-performance 2/3-inch broadcast and professional video lens. It features an 18x zoom ratio and a 9mm wide-angle focal length. This guide serves as a manual to help you set up, calibrate, and maintain your lens for optimal performance. Key Technical Specifications
Features an Internal Focus (IF) system, meaning the lens length remains constant during focus adjustments, which helps reduce flare and chromatic distortion.
No, this lens was primarily designed for standard definition (SD) broadcast cameras. That said, many users report it performs admirably on modern HD and even 4K cameras, especially when stopped down. It is often used on cameras like the Blackmagic URSA with good results. Requires a mechanical gear attachment on the focus
If your image is sharp at 9mm but soft at 162mm, you likely have a back-focus issue. The manual provides a step-by-step guide for the Flange Back Adjustment . This usually involves loosening a set screw and rotating the focus ring to align the focal plane.
Regular maintenance extends the lifespan of professional broadcast optics.
Follow these steps to safely attach the lens to your 2/3-inch B4 mount camera. Turn off the camera body before mounting. Follow these steps exactly
Before diving into technical execution, tracking the baseline physical and optical characteristics of the Canon YJ18x9B4 KRS/IRS series provides proper parameter context: Technical Metric Factory Specification 18x Optical Zoom Focal Length Range 9mm (Wide) to 162mm (Telephoto) Maximum Relative Aperture f/1.8 (9mm to 114mm) / Ramping to f/2.4 at 162mm Format Coverage 2/3-inch Sensor Size (B4 Bayonet Mount) Focusing Mechanism Internal Focus (IF) Technology Minimum Object Distance (M.O.D.) 0.8 meters (approx. 2.6 feet) Front Filter Thread Diameter 112mm / 82mm inner thread variations Anatomy of the Lens Ring Assembly
Perform this adjustment if the image loses focus while zooming from tight to wide.
Need a specific diagram of the top button layout? Search for "Canon YJ18x9B4 exploded view" — the part numbers will confirm your lens's revision.
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