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Im thinking about upgrading from my Olympus m4/3 to something bigger. Im considering sony a7r, but im really not sure about size and heaviness of a full frame telephoto lens. What would be a good portable telephoto choice that I can operate with just hands. Maybe APS-C would be a good choice, im really not sure. Currently im on m4/3 150mm 300mm equivalent, thinking about upgrading to bigger sensor and 600mm or more equivalent.