A few days ago I replaced my Micro 4/3 Panasonic 45-200mm lens for a 100-300mm lens. In 35mm film format this is the equivalent of 300-600mm long. Let me tell you, this is a completely different beast than the previous lens! I have to hold this one much more steady to get good shots but I tested the lens for the first time today and it performed beautifully. I can certify that this lens is tack sharp and will kick butt and will require some getting used to. How does it perform? It will definitely do its job. The only drawback that I don’t like about this lens is the construction where the rear element isn’t enclosed and can allow dust to get sucked into the lens internals while adjusting the focal lengths. Other than that, I can foresee this lens becoming my main shooter because it makes me feel like the Paparazzi! đŸ™‚