Manufacturer's Description
This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, and 100-400 f/4.5-5.6L IS zoom lenses. 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. The version II maintains the outstanding optics of the previous version, and adds enhanced weather- resistant construction, and improved anti-reflective surfaces in the barrel.
Product Description
The EF 1.4x II extender is the practical and efficient solution to increase the focal length of lenses by a ratio of 1.4x with no noticable loss of image quality. The water proof build is designed to be compatible with Canon's full EOS range of bodies and lenses for images of an even higher quality!
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