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Seriously, the 100-400mm f/4.5-f/5.6L is sharp both at the 100mm and 400mm ends, wide open at both f/4.5 and at f/5.6. It is a cracker.
2 stops of IS means, that if a decent/sharp exposure was normally taken at 1/100s, then, with image stabilisation, you can get the same (theoretical) sharpness by shooting at 1/25s (1/100s -> 1/50s -> 1/25s).
Panning means that you can move the lens left to right (or up and down) and it will stabilise in the one axis. Think of photographing Tour de France cyclists -- they remain sharp, but, the background is smeared.
The IS available nowadays can give you up to four stops of handholdability (so, using the example above: 1/100s shot with same theoretical sharpness can be taken at 1/6s [1/100s -> 1/50s -> 1/25s -> 1/13s -> 1/6s]). The 100mm f/2.8L II macro has hybrid IS, which gives you up/down and rotational image stabilisation.
H
Last edited by Octane; 13-10-2011 at 11:56 AM.
Reason: s/sharpenss/sharpness
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