The following images were taken at different aperture values.
They were f/3.5, f/5.6, f/8.0 and f/16.

Testing condition:
The photos show the rock surface on the pavement.
I tried my best to ensure the film plane and the pavement plane aligned with parellel direction.
RDPIII. Auto focus. Tripod with self-timer on. Same object distance.
4000dpi with 14 bit and 8x scanning. ICE OFF.
JPEG conversion from TIFF with 12 compression ratio.
Comparison is made by 100% crop of the scanned images.