Excerpt: A little friendly competition is always good. In the case of playground battle between Canon and Nikon, the shooters usually win, and Canon’s much-delayed response to Nikon’s fantastic 105mm f/2.8 macro lens, the Canon EF 100mm f/2.8L IS USM Macro ($900) has win written all over it.
Excerpt: Canon EF 100mm f/2.8L IS USM is the newest addition to the manufacturer's lineup of macro lenses, and is the second 'Pro' grade (or 'L') classified macro lens besides the EF 180mm f/3.5L Macro USM.
Summary: Canon EF 100mm f/2.8 USM Macro is one of the best lenses in Canon's modern portfolio. The lens exhibits very even performance across pretty much entire aperture range on both APS-C and full frame cameras.
Conclusion: Canon delivers everything that a photographer could want in a 100mm macro lens: ultrasonic focus motor, internal focus mechanism, non-rotating front element, floating optical group for consistent image quality at different magnifications, rugged construction, and reasonable price.
Canon EF 100mm f/2.8 USM macro (full format) - Review / Test Report
2 March 2010
Conclusion: The Canon EF 100mm f/2.8 USM macro may not have the shiny reputation of an L grade lens but it's a great performer nonetheless. It provides sharp images straight from f/2.8 all the way down to f/16 and neither distortions nor lateral CAs are something to worry about.