Whether one needs the IS or non-IS depends on the usage. There's no universal "general usage" as many have alleged. If there is such, then Canon could have made only one 70-200 and be done with it. Some people shoot still subjects more, for them IS is useful. For others, it may not. There is no "definitely IS". TS must decide what he needs upon his kind of shooting and probably he may well decide to use IS.
One up for the F4 IS, since the TS is looking at only these two.
If specifically for F1 once a year? - dont buy, just rent.
IS definitely is not for freezing motion. But if you are doing panning shots for moving objects, the 70-200's IS has 2 modes. The mode 2 IS is specifically for panning. In this mode, the IS is for the plane perpendicular to the panning direction. e.g. panning shot of car left to right, the IS is for up/down hand movements. Therefore, I think it does help (again, this is for shaky hands, not to freeze motion).
thanks all ..now decided to rent liao ..but th prices are darn unreasonable ...anyone know a gd rental place n where i canget the best prices for canon lenses ?
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