I have the 150-500 Sigma and have had no problems with auto focus I usually use it in AP mode set to F8 for birding and wildlife. Although the canon is the better quality lens if you can afford the extra I am quite satisified with the sigma.
Keith.
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I have the 150-500 Sigma and have had no problems with auto focus I usually use it in AP mode set to F8 for birding and wildlife. Although the canon is the better quality lens if you can afford the extra I am quite satisified with the sigma.
Keith.
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