Having used both the Canon 70-300 without IS, and the Canon 70-300 WITH IS (this lens), it is ABSOLUTELY worth the extra $400-$450 for this lens. The image stabilization is truly amazing. It allows you get the shot you want from across the room without having to worry about shakiness.
Having said that, there are a couple of small negatives to this lens.
One, it's a little bit heavy. Not nearly as heavy as the 70-200 f/2.8L IS, but certainly heavier than the 70-300 non IS.
Two, there is no manual focus override in auto-focus mode. i.e., you need to flip a switch in order to manual focus. This is probably the most annoying complaint I have. You simply cannot turn the focus ring by hand with auto-focus on.
Three, the auto-focus can be pretty slow sometimes. For example, if you are focused on something 5 feet away, and then try to focus on something 60 feet away, it can take as long as 1-2 seconds.
Four, this is NOT a macro lens. It says on the lens "macro," but that's phooey. It's a blatant misuse of the word. Granted, you can get some pretty nice close-ups, but you're not going to be getting useable pictures of insects.
I know I focused more on the negatives than the positives, but that's what you want to hear isn't it? The issues I have with the lens? Overall, it's an absolutely phenomenal lens. It's tremendously fun, and the quality of pictures you can take with it FAR outweighs its inconveniences.Buy Canon EF 70-300mm f/4-5.6 IS USM Lens for Canon EOS SLR Cameras!
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