Together with my EF 70 - 200mm F4 L IS USM on a EOS 700D I am fully on enthusiastically. Impeccable cooperation of all components. Hand-held shooting at sufficiently light are problems. With excellent tripod. The build quality is as you would expect. Very valuable. The EF 1,4xIII is a useful supplement to extend the focal length range. Otherwise, I refer to my previous reviewers reviews which on the whole with my experience and the Canon Extender EF cover 1,4xIII.
