In January I tested the two 300's and the results wide open definitely favored the one without IS, but I bought the 100-400 anyway because the sharpness difference was negligable in A4 prints and it felt like I was taking better pictures with it. Usually its best to go with what feels right. In Stockholm it wasn't too difficult to rent and test all three and I'd imagine its at least as easy in the states. With this trio you really can't make a bad choice!
Canon 300F4 IS or Canon 100-400mm?
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