New internally zooming, internal focus F2.8 L-Series hybrid telephoto zoom lens featuring an iris ring for manual iris control. Nano USM motors are used for two floating focus units that can work in tandem or independently providing fast and quiet focus - great for video. L-Series level durability and weather-resistant construction for use in harsh environments helps ensure reliability and dependability. Compatible with Power Zoom Adapters PZ-E2/PZ-E2B. Focus breathing control during video shooting.