Canon EF 1.4X III Telephoto Extender for Canon Super Telephoto Lenses

The Canon Extender EF 1.4X III is a high-performance teleconverter engineered to extend the reach of compatible Canon EF mount L-series telephoto lenses by 1.4x without compromising image quality. It’s the ideal solution for photographers looking to capture distant subjects such as wildlife sports or news scenes without lugging heavy ultra-telephoto glass. The redesigned optical formula includes seven elements in three groups all treated with Canon’s Super Spectra coating to minimize flare and ghosting. Both the front and rear elements feature a fluorine coating that resists water dust and fingerprints for easier cleaning and maintenance. An integrated microcomputer ensures smooth communication between the lens and camera preserving full functionality such as autofocus and exposure metering. Despite the 1-stop light loss the extender works seamlessly with Canon’s top-tier lenses to maintain high autofocus accuracy even with moving subjects. The lens mount design allows for quick attachment while limiting exposure to the elements supported further by a rugged weather-resistant construction. This extender is specifically optimized for fixed focal length lenses 135mm and longer as well as certain 70-200mm and 100-400mm zooms. Always consult your lens and camera manuals to confirm full autofocus support.