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The 100-400mm f/4.5-f/5.6L IS USM is a remarkable, remarkable lens.
I have shots taken with it using the Extender 1.4x II, and, even then, at 560mm at f/8, handheld, the images are nothing short of sublime.
The zoom has incredible natural contrast, colour saturation and pin sharp image quality, that you don't really need to do much to the image in post, other than the standard RAW sharpening.
The only two downsides to the zoom is that it is very heavy (I think of this as a minor issue) and that it is a push-pull system -- it has external moving parts, which can act is a dust collector. Still, it is weather sealed. If my 5D Mark II and 17-40mm f/4L USM can withstand being dumped by water from a waterfall 160m high, then, the 100-400mm f/4.5-f/5.6L IS USM can withstand anything.
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