500mm lens = 750mm on CANON DIGITAL SLR. size of lens will be lens lens 750mm. ON CANON 5D 5D MARK II 5D MARK III SIZE WILL BE 500MM. THIS LENS WILL WORK ON ALL CANON EOS & EOS DIGITAL SLR. CANON EOS 300D 350D 400D 450D 500D 550D 600D 650D 700D 750D.
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