EOS
Canon EOS System - EF 1.4 Extender II
Canon EF 1.4x II Tele-Extender

Installation and removal is easy. Using the 1.4x will make the 70-200mm into a 98-280mm lens. There is a loss of one f-stop (so an f/2.8 lens becomes an f/4 and the 70-200 f/4 becomes an f/5.6). For outdoor sports or racing photography this is not really noticeable.
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