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Thanks to an optical design made possible by the RF mount, the RF 28–70mm F2 L USM lens is able to render image quality at f/2 that rivals that of the EF 24–70mm f/28 at f/28 With an extra stop of light, this means faster shutter speeds or lower ISOs for enhanced image quality, and marvelous performance when shooting moviesThe Canon EF 2470mm f/28 USM L is one of main stream pro grade lenses in the Canon line up and very popular among pro photographers (especially press) as well as serious amateurs On APSC DSLRs its fieldofview resembles a classic mm lens on fullframe cameras which isn't terribly useful to start withThe Canon EF 24–70mm lens is a family of professional EF mount widetonormal zoom lenses manufactured and sold by CanonThe first of the family, the EF 24–70mm f/28L, was introduced in 02 to replace the wellregarded 28–70mm f/28LTwo later versions were announced in 12 The first of these, the EF 24–70mm f/28L II, was announced by Canon in February, but would not ship to C...