Hi Siddiq:
The 100mm f/2 focuses down to 1:5 magnification ratio (a correction to Alex's
posting). Both it and the 90mm f/2 macro have close focus aberration
correction. The 100mm has an ED element, but performance-wise my lens
testing (http://members.aol.com/olympusom/lenstests/default.htm) shows them
to be about dead ringers at 1:40 magnification, as well as both in the group
of "best" Zuiko lenses (which includes Alex's 50mm f/3.5 Macro).
Gary Reese
Las Vegas, NV
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