I don't want to hijack your thread Tangata, but I want to ask Harry if he considers the 100-400 more versatile than the 70-200, and is the f-drop any kind of a limitation, beyond the obvious? I've been juggling the possibility of these two lenses for months now, and still can't decide. I know that when my savings creep towards that £1000 mark, the 100-400 might just beat the 70-200, simply by being cheaper! ...unless i can be persuaded otherwise? It would be used primarily for birding, motor racing events, and some general use.
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