The lens test page at:
http://members.aol.com/olympusom/lenstests/default.htm
already reports distortion and vignetting (fall-off) for all the Zuikos,
including zooms at three different focal lengths (at least). I'm not
sure what another testing round would prove. If there was any
distortion differences to be had, it might be among the floating element
designs at a closer focusing distance.
Gary Reese
Las Vegas, NV
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