Reviews and Problems with Canon EF 100mm f/2.8 Macro USM
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21 October 2011
Conclusion: Overall then, this lens is a capable performer, with quick and silent autofocus system and generally good to excellent image quality. While more expensive then the Tamron SP AF 90mm F/2.8 Di Macro 1:1, it has the distinct advantages of an internal focusing system and a much quieter motor.
Excerpt: While some macro lens barrels extend alarmingly to focus in really close, the Canon EF 100mm f/2.8 Macro USM uses an internal focusing mechanism so the lens remains the same length at all times. Focusing is virtually silent, thanks to the ultrasonic motor (USM), and very accurate with minimal hunting.