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hmm. this thread is interesting to me cause i'm considering investing in canon kit over the winter that's at least the equal of my nikon stuff, which is the nikon 80-400mm lens and a d70. thinking about the shots i've taken this year at the circuit i've ended up using the far reach of zoom more often than not so i guess a 300mm lens with extender wouldn't cut it.
is there a difference in autofocus between the canon and sigma?
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