D850 @ x 0.41

Resolution: This lens achieves good resolution in the centre but corner resolution are a little disappointing. This lens performs well for non-macro photography but has strong competition from lenses designed for macro performance. Resolution figures on a D850 are considerably better than on a D800.

Chromatic Aberration: Moderate but decreasing with stopping down

Vignetting: Moderate at f/4 but decreased stopped down

Macro Sweet Spot: f/11