The (IRS/KRS) is a professional 18x zoom lens designed for 2/3-inch B4 mount cameras, primarily used in SDTV news gathering and field productions. While officially categorized as a Standard Definition (SD) lens, it is highly regarded for its lightweight design (approx. 1.2kg to 2.3kg depending on the specific model and accessories) and sharp internal focus (IF) system. Core Specifications Focal Length: 9mm to 162mm. Zoom Ratio: 18x.
The IRS variant includes a built-in 2x extender, doubling the focal range for specialized telephoto needs. Top Maintenance & Setup Tips
Approximately 1.2kg (KRS) to 2.3kg (standard assembly). Lens Mount: 2/3-inch Bayonet (B4). Manual & Operational Highlights canon yj18x9b4 manual top
The front end remains stationary during focusing, which reduces chromatic distortion and flare while allowing for consistent use of front-mounted filters.
For full technical documentation, users should refer to the Canon User Manual Library or Canon UK Support by searching for "YJ18x9B4" or the associated camera system. Canon YJ18x9B4 IRS-A SX12 1.8 B4 Lens Test - Vimeo The (IRS/KRS) is a professional 18x zoom lens
It supports digital servo zoom control and manual iris adjustment (typically ranging from f/1.4 to f/16 or closed).
The lens body is finished with a specially developed protein paint designed to absorb moisture and provide a comfortable, fatigue-free grip for long shooting sessions. Core Specifications Focal Length: 9mm to 162mm
This lens is a popular choice for adaptation to modern mirrorless or cinema cameras (like the Sony FS7 or Panasonic GH series) using B4-to-E or B4-to-MFT adapters.