Canon EF 100mm f/2.8 USM Macro Lens Review @ The Digital Picture

"Utilizing USM (Ultrasonic Motor), the Canon 100 Macro internally focuses very fast, quietly and very accurately. I've been questioned on the fast AF statement several times since writing this review. I've rechecked my lens and, though it takes a little time to go from 1:1 macro to infinity, it focuses very fast at normal focusing distances. The second person to question this exchanged their lens for another

- the replacement was much faster than the original lens they received. This would indicate to me that there may be an issue with some samples of the Canon EF 100mm f/2.8 USM Macro Lens. Another site visitor emailed me - they were ecstatic that a firmware upgrade to their Canon EOS 1D Mark III DSLR resolved their 100mm Macro focusing speed issue. Also note that there is a discontinued non-USM version of this lens. Keep these datapoints in mind if you run into a slow version of this lens. "

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