Product Description
Equipped with an Image Stabilizer, the Canon EF 100-400mm telephoto zoom lens makes it easy to capture the far-off action of fast-paced sports or zoom in for an intimate portrait with a blurred background. The lens offer such features as fluorite and Super UD-glass elements that largely eliminate secondary spectrum; a floating system that ensures high picture quality at all focal lengths; two Image Stabilizer modes; and compatibility with extenders 1.4x II and 2x II. The lens carries a one-year warranty. Read More
This lens is awesome. I have had mine for 4 years without any problem with the focusing but this is what i do. Because the lens is heavy it comes with a lens bracket to mount the lens to a tripod or monopod instead of the camera body. I use a mono pod mostly. Yes this makes a lot of difference and the pod acts like a third hand. You are not going to get really sharp pictures unless you use one especially extended at 400 mm. second is it is an outdoors lens. you can use it inside but your pics are not going to be as good as they could be with daylight even on a cloudy day. 3rd the more manual you can get with this lens the better. the I.S. is fast smooth and quiet but relying on the af when shooting is not ideal because when you push the firing button half way down on the camera the af feature is always adjusting so if you move so will the point of reference with the I.S. I like it. It is not for everyone. Large telephoto lenses take a little practice, it is worth the time and effort. The large telephoto non zoom lenses are much easier to use when trying to get a really sharp image.just in case you were thinking about going that way.
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More Detail : http://www.amazon.com/exec/obidos/ASIN/B00007GQLS/tipfla-20