Canon Extender EF

Canon Extender EF

The Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, such as the Canon EF 500mm f/4L IS USM, they will multiply the focal length of the lens by a factor of either 1.4× or 2.0×. This will result in a focal length of 700mm or 1000mm, respectively, with a 500mm lens.

Canon has released six models:

• 1.4×
• 1.4× II
• 1.4× III
• 2×
• 2× II
• 2× III