None of Canon's Teleconverters are compatible with the EF 24-70mm F/2.8L USM series lenses. I would look into a longer lens instead of using a teleconverter. With the 1.4x teleconverter you loose 1 stop of light. A compact super-telephoto L-series lens with f/5.6 aperture USM lens for outdoor sports and wildlife. EF 50mm f/1.2L USM Professional L-series, f/1.2 aperture USM lens for low light and extreme depth of field control.

Canon calls this the CANON ZOOM LENS EF 24-70mm f/2.8 L II USM. EF means "electronic focus," meaning that there is an autofocus motor in the lens itself. All Canon lenses since 1987 have been EF. L only means as expensive as L; it means nothing technically.

Canon's EF 24-105mm f/4L IS USM is a popular choice amongst those after 'L' series lens quality, but with a decent zoom range. the EF 24-70mm f/2.8 USM, which has a fantastic reputation for
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canon ef 24 70mm f 2.8 l is usm lens