Just the other day a guy was asking in a forum for a good reason to buy a Canon 180 Macro instead of the Sigma model. Non compatibility issues were the only solid argument I came up with. Still, the Canon lens costs 2,5x the price of the Sigma. So the question "should we Canon prices for assured compatibility?" springs to mind. I mean, even inside Canon's line-up, EF-S lens compatibility with previous digital bodies is not assured, as far as I know.
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