This lens utilizes technology, meaning the front element remains stationary and the lens barrel does not change length during focusing.
(often the SX12 module) that allows for electronic control of zoom and iris. You can transition from wide to tele in approximately 1.7 seconds, providing the speed needed for live sports or breaking news. ES Broadcast 3. Understanding the Nomenclature
A dedicated ring near the mount allows for ultra-close focusing.
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.