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Leon my experiences have been similar to Dennis,s it's a great lens.I have even used it with the old 2x ext for moon shots.It is a very sharp lens for the price.I compared it with the new 100-400 and it is marginally better. The 100-400 version 2 from Canon may also be worth a look.What I really like though is that being 77mm in diameter I can use filters with a lot of lenses such as the 24-105 and the Sigma 24mm which makes it versatile for travel especially when weight is a consideration.And with today's cameras having better low light capabilities than when I purchased the 400 it really is a keeper.
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