New 50mm L-Series hybrid lens featuring an iris ring for manual iris control.. Nano USM is used for floating focus and a Voice Coil Motor (VCM) for rear focus, great for video.. L-Series level durability and weather-resistant construction for use in harsh environments helps ensure reliability and dependability.. Incredibly minimal focus breathing - within 2.5% of the entire range in the lens alone! Further electronic breathing correction brings it to within 1.0% of the entire range.. Air Sphere Coating (ASC) helps to significantly reduce lens ghosting and flare.