Resolution
We tested the AF-S DX Micro Nikkor 40mm f/2.8G lens on a Nikon D7000 DSLR camera. An image was taken of our test chart with the lens set to each of its apertures, with the results shown below. Overall the lens performs very well, with it being at its sharpest at f/8. However, there is a reasonably significant fall off in sharpness at f/22.

Image: At its centre the 40mm macro lens is very sharp, revealing the finest of details