sentences:  Conversely, the same lens can produce different fields of view when mounted on different cameras.For example, a 35 mm lens mounted on a Canon EOS 5D (full-frame) provides a slightly wide-angle view, while the same lens mounted on a Canon EOS 400D (APS-C) provides a "normal" or slightly telephoto view.In order to make it easier to compare lens–camera pairs, it is common to talk about their 35 mm equivalent focal length.