Hello I am spending 10 weeks in Africa next year and am looking for a zoom to couple with my E-M5. Has anyone used this lens on safari or similar, and what were your experiences of it? Is it the best option available for an Olympus body? The equivalent 600mm focal length is very useful, but how achievable is that? I won't be using a tripod so it will be handheld, possibly resting on trucks or whatever. Thanks!