Click here to read our Olympus 12-45mm f/4 Pro Field Test One of the major selling points of the Micro Four Thirds system is its compact form-factor. Both cameras and lenses can, and often are, much smaller and lighter than competing systems that use larger sensors. For lenses though, when you start to factor in qualities like constant aperture zooms, weather-sealing and metal construction, the size and weight tends to increase. For Olympus' Zuiko Pro line of high-end lenses, while they are still much smaller and lighter than...
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