Canon Extender EF 1.4x III

1.4x increase of the lens's focal length

Dustproof and waterproof specifications (JIS 2 equivalent)

Lens placement and coatings are optimized to minimize the ghosting

Built-in microcomputer in the extenders enables communication between lens, extender and camera

Anti-smear coating (Silky Barrier Coating) used to enhance smear-free state of the lens surface