Canon EF 1.4x II Extender
The very affordable way to noticeably extend the reach
The Canon EF 1.4x II Extender is an easy and very affordable way to noticeably extend the reach(focal length) of compatible Canon L Series lenses (and a few additional lenses).
The Canon EF 1.4x II Extender mounts between the compatible lens and body, and multiplies the focal length settings of your lens by 1.4x. That’s the good news – the bad news is the 1.4x decreases/narrows your lens’ aperture setting by 1 stop. The lens aperture still opens to the same width, but the ratio of the aperture opening to the focal length is reduced – by 1 stop.