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Designed to take advantage of everything the RF mount has to offer RF lenses represent a new frontier in lens design for mirrorless cameras. With a large 54mm lens mount large diameter elements to match and placement closer to the image plane RF lenses provide brilliant image quality edge-to-edge with minimal light fallout enabling new possibilities for enhanced optics and compact designs. A supercharged 12 pin communication system optimizes data transfer between camera and lens for sharp stable and responsive performance in a wide variety of applications.Delivering features and performance engineered to astound RF optics herald a new day in Canons legacy of optical brilliance. NEW LENS DESIGNS WITH STELLAR IMAGE QUALITY Control Ring All RF lenses incorporate a control ring on the lens barrel that can directly adjust numerous settings including shutter speed aperture exposure compensation and more. Located towards the front of the lens and effectively adding a third dial to the EOS R cameras main dial and quick control dial the control ring has a tactile easily distinguished surface and features a clicking mechanism that provides tangible feedback for confident use while looking through the viewfinder Lens Information Display Another helpful feature the EOS R camera can display lens information right in the viewfinder making it easy to confirm the lenss focal length without looking away from the subject at hand. RELIABLE IMAGE STABILIZATION TECHNOLOGY Optical Image Stabilization Select RF lenses feature optical image stabilization technology thats designed to work in conjunction with the EOS R camera. Both the camera and the lens share data to dramatically reduce camera-shake blur regardless of the situation and whether shooting video or stills to deliver impressively clear results. CONSISTENT F/2 BRIGHTNESS THROUGHOUT ZOOM RANGE RF 2870mm F2 L USM The RF 2870mm F2 L USM features a maximum aperture of f/2 offering unparalleled performance throughout its zoom range. With L series optics it offers the flexibility and performance of a handful of fixed focal length lenses delivering superlative performance from 2870mm. ____________________________________________ Specifications: Lens Series Canon Color Black Lens Type Wide Angle to Telephoto Zoom Lens Mount Canon RF Format Compatibility Full Format Focus Type Auto Focus Closest Focus Distance 1.28ft / 0.39m Focal Length 28-70mm Angle Of View 75 degree 00′ – 34 degree 00′ Maximum Aperture f/2 Minimum Aperture f/22 Maximum Magnification 0.18x Filter Size 95mm Lens Elements / Groups 19 Elements / 13 Groups Diaphragm Blades 9 Blades Dimensions Diameter x Length 4.1″ x 5.5″ Weight Approx. 3.15 lbs