Canon’s EF 1.4x III Extender is designed for use with Canon L-series telephoto lenses. This increases the focal length for the attached lens by a factor of 1.4x with minimal loss of light and image quality. The Mark III version of this extender provides enhanced environment seals, a designed optical assembly with coated elements. Full shooting functionality and metadata capability is provided when using this teleconverter.
A carefully positioned lens release mechanism also makes it easy to mount the extenders quickly, reducing the time that the camera and lens are exposed to the environment. The extenders offer the exceptional build-quality expected from Canon’s professional products, and are resistant to both dust and water, allowing photographers to depend on them in all conditions.