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I have been reading up on all the canon lens reviews inparticular the 400 F5.6 your using Dennis.
They have a huge following and are great value lens.
I was ponding between the Sigma 50-500, Canon 400mm L and the 100-400 L with IS.
I have decided to get the 100-400 L only for flexibility even though it's not as sharp as the 400 L, I think I will get more use out of it carrying hand held with the IS.
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