A true optical standout by almost all measures, the lens produced SQF sharpness/contrast numbers in the Excellent range at 35mm and 100mm, and "Double Excellent" at 75mm, with most scores at or above the 90th percentile; its lowest score was an admirable 79.4%. Ditto for distortion. DxO Analyzer 2.0 tests found only Imperceptible pincushion distortion at 35mm, 75mm, and 100mm (0.04%, 0.06%, and 0.08%, respectively). As for light falloff, we found marginal evidence of it at 35mm and 100mm (gone by f/2.5), and none detectable at all at 75mm. At the uniform close-focus distance of approximately 48.5 inches, maximum magnification ratios ranged from 1:22.8 at 35mm to 1:8.77 at 100mm -- for macro mavens, that's the Achilles' heel.