Distortion and vignetting in the Excellent range, plus super sharp optics. Very well constructed, but on the heavy side. Maximum magnification: 1:0.91.
Standout Spec: Very helpful three-way focus limiter.
Lens Test: Sigma 70mm f/2.8 EX DG Macro AF
Olympus Zuiko Digital ED 50MM F/2 Macro
Tamron SP 60mm f/2 DI II Macro
Sigma 105MM f/2.8 EX DG Macro
Sigma 50MM F/2.8 EX DG Macro
Canon EOS 7D
Sony Alpha 550