Canon RF 400mm f/2.8L IS USM - Canon RF Mount

The Canon RF 400mm f/2.8L IS USM is a flagship super-telephoto lens for the EOS R mirrorless system. It shares its optical design with the EF Mark III version but features a native RF mount for faster communication and improved stabilisation performance when paired with In-Body Image Stabilisation (IBIS). It is remarkably light for its class, weighing approximately 2.8kg. When evaluating a used RF 400mm, check the customisable control ring for smooth movement and the electronic focus ring for responsiveness. SDS examines the mount for any signs of heavy wear and checks the weather-sealing gaskets. Ensure the various AF distance limiters and IS mode switches click firmly. Given its value, the internal glass is scrutinised for any imperfections or dust ingress that could impact high-resolution sensors.