Saturday, January 29, 2011

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

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