Reviews and Problems with Canon Extender EF 1.4x III
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Canon EF 1.4x III Extender
The Digital Picture
7 November 2010
Excerpt: The Canon EF 1.4x III Extender mounts between your Canon EOS Digital SLR and a compatible lens (primarily Canon L Series lenses), extending the focal length of the lens by a noticeable 1.4x. The 1.4x III is a small and light addition to your kit, an only moderate hit on your wallet and it provides a noticeable increase in your focal length.