James McCauley wrote: > How does Canons 100-400L compare in sharpness & speed of auto > focusing to > their 70-200L? -------------------------------------------------------------- In terms of sharpness you will not see any difference in the 100 to 200mm range with both lenses at F8. There is a slight edge to the 70-200mm of about 5% but it would be very doubtful you will ever see this difference unless you enlarge to 24x30. As to AF speeds, the 100-400mm is slightly slower than the 70-200mm. This is not to say it is slow at all, just that the 70-200mm is very fast. One note, some Canon EOS cameras like the EOS-3 and 1v can make better use of F2.8 lenses when it comes to focus tracking. Check your camera manual to determine if this helps you in any way.
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