This lens produces very good resolution across the whole frame from f/5.6 to f/8. The only let down is chromatic aberation that can be reduced with post-processing or use of camera JPG or TIFF
Resolution: This lens achieves excellent resolution at f/5.6 and f/8 across the whole frame
Chromatic Aberration: High when stopped down.
Vignetting: Moderate to high at all apertures
Macro Sweet Spot: f/8 (even across whole frame)