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  1. nsclayton

    Used Canon EF 300mm f4 L IS USM Lens

    Hi Jono L I can't see what you would gain by making this trade. The 300mm is of similar size, weight and quality as the 100-400. The big plus for the 100-400 is the focal range gives it more flexibility. You could add a 1.4 extender to the 300mm and get 420mm f5.6 but this isn't much different...