Fast f/1.8 (or T1.8), making it effective for low-light environments. Mount Type: Standard 2/3" Bayonet (B4 mount).
If the image is blurry, loosen the back focus locking screw on the lens and turn the ring until the image is perfectly sharp.
Understanding the technical boundaries of your lens ensures optimal image quality. 9mm to 162mm (18x zoom)
Canon’s model names can look like alphabet soup, but each letter tells a story: Part of the "Pro Video" series for 2/3" sensors. The zoom ratio. The widest focal length (9mm). KRS vs. IRS: Generally, stands for Servo Zoom/Manual Focus, while
is an 18x professional broadcast zoom lens engineered for high-performance field, ENG (Electronic News Gathering), and studio productions. Built for cameras utilizing the standard , this lens offers a versatile 9mm to 162mm focal range paired with a fast f/1.8 maximum aperture .
Properly adjusting the back focus (also known as flange focal length) ensures your lens remains , meaning it stays in focus throughout the entire zoom range. This is crucial for professional shooting. Here is the standard procedure: canon yj18x9b4 manual top
Plug the 12-pin lens data cable into the camera's lens interface connector. This powers the iris and zoom motors and enables electronic communication. Back Focus Adjustment (Flange Focal Length)
: A unique coating developed by Canon to absorb moisture and enhance the tactile feel of the lens in various weather conditions. Legacy and Use Today
Capable of zooming from wide to tele in approximately 1.7 seconds .
Rotate the manual focus ring until the target chart is perfectly sharp. Zoom out completely to the widest focal length ().
Are you trying to find the ? As this lens has become a staple in the used market for broadcast and industrial video, many new owners find themselves without the original documentation. Fast f/1
: Capable of focusing on subjects as close as 0.9 meters (approx. 3 feet), allowing for tight close-ups in cramped environments.
This lens was a workhorse for SD (Standard Definition) and early HD cameras. Today, it is popular among indie filmmakers adapting B4 lenses to Micro Four Thirds or Blackmagic cameras due to its parfocal design (stays in focus while zooming) and fast aperture.
Manually rotate the (the thin ring right next to the mount) until the wide-angle image is perfectly sharp. Do not touch the main focus ring during this step.
Internal Focus (IF) design, meaning the lens length remains constant during adjustments. 🛠️ Operation & Maintenance Highlights
—specifically focusing, zooming, and using the macro setting—you can ensure your footage is sharp and professional. The "manual top" functionality gives the operator precise control required for high-stakes broadcast environments. Understanding the technical boundaries of your lens ensures
Features an Internal Focus (IF) system, meaning the lens length remains constant during focus adjustments, which helps reduce flare and chromatic distortion.
Located at the absolute front of the barrel. It features a heavily ribbed rubber grip for smooth manual focus pulls. Because the lens uses an system, the front of the lens remains stationary, allowing square hoods and specialized filters to stay perfectly aligned. 2. Manual/Servo Zoom Mechanism
The B4 mount is not directly compatible with modern mirrorless or DSLR cameras. To use it, you will need a B4-to-Mirrorless/DSLR adapter (e.g., B4 to Micro Four Thirds, Sony E-mount, or Canon EF-mount). Keep these important factors in mind:
| Issue | Likely Solution | | :--- | :--- | | | Check the 26-pin mount connection. Ensure the camera is powered on and lens power is active. Some older controllers may interfere with camera functions. | | Focus is soft or "dreamy" | Verify correct back focus calibration. Also, the lens is sharpest when stopped down slightly from wide-open aperture f/1.8. | | Zoom or focus servos are unresponsive | Inspect the 12-pin cable for damage. Test the lens on a known working camera to isolate the issue. | | Image doesn't cover the sensor | Disengage the built-in 2x extender (IRS models). On non-IRS models, the lens may not fully cover a Super 16 or larger sensor at wider focal lengths. | | Lens feels "stiff" when focusing | Lubricants can dry out over time. This often requires professional servicing. |