SQF testing on our optical bench showed Excellent at all three focal lengths. DxO Analyzer 3.2 tests revealed Visible pincushion distortion (0.59%) at 16mm, and Slight pincushion (0.24% and 0.20%) at 50 and 105mm. Both of these results are on par with the Nikon 18-105mm f/3.5-5.6 lens (tested 12/08) and the Sigma 18-125mm f/3.8-5.6 (tested 10/08) and perfect by today’s standards. The Sony, however, did slightly better than the Nikon and Sigma for light falloff. At 16mm, light falloff was gone by f/5.6, at 50mm by f/5, at 105mm gone by f/5.6. The Sigma lost this battle at the widest focal length, with light falloff gone by f/8. The Nikon lost at the tele end with light falloff gone at f/8. Both a whole stop difference, definitely significant. The average close-focusing distance for the Sony was 15.04 inches with the max mag at 16mm 1:14.25, at 50mm 1:6.70 and at 105mm 1:4.07. This was slightly better than the Nikon, but not as good as the Sigma, which went down to 11.5 inches, 1:3.10 at 125mm.