Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates phenomenal optical performance with minimal chromatic aberration and is a perfect complement to many of Canon super telephoto lenses. The Fluorine coating resists soiling, smears and fingerprints. Extender EF 1.4X III maintains high standards not only optically, but also in terms of rugged, dustproof and water resistant construction.
Superb optically, it preserves the image quality of the lens it's mounted to and multiplies its focal length 1.4x. Effective aperture is reduced by one f-stop; autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture.
Note from Canon: This convertor is only compatible with fixed focal length L-series lenses
135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/2.8L IS II, EF 70-200/2.8L IS III, EF
70-200/4L IS, EF
70-200/4L IS II, EF 100-400/4.5-5.6L, and EF 100-400/4.5-5.6L IS II. Additionally, please see the lens
and/or camera body manual for full compatibility information with the
Extender EF 1.4X III. AF speed and IS function may be limited or not functional when used with a extender.
your lens is not Canon manufactured or is not mentioned in the above
list please bring the camera and lens you would like to use with this
convertor when you come to pick up your rental to ensure function before