Canon RF 800mm F11 IS STM Lens by Canon at B&C Camera
Camera Mf Super Telephoto Zoom Lens F/8.3-16 420-800mm T Mount With1/4 Thread For Canon Nikon Sony Fujifilm Olympus Cameras - Camera Lenses - AliExpress
Canon 800mm f/5.6 - Luminous Landscape
Canon EF 800mm lens - Wikipedia
Amazon.com : Canon EF 800mm f/5.6L is USM Super Telephoto Lens for Canon Digital SLR Cameras : Camera Lenses : Electronics