I found this rock in the driveway; I re-graveled it a few months ago. To the eye, this was a smooth pebble with spots on it, but the macro photograph above shows it is actually pitted and rough. The scale of the roughness is too small to feel.
I used my automated setup, and took 60 images which I combined in two focus stacks. I then combined the stacks. Each image shows a small part of the rock in focus. Here’s a cropped portion of a single shot that shows just how narrow each focused slice is:
I combine the images in Affinity Photo using its Focus Merge feature.
The image at the top is reduced to meet the requirements for upload for this blog; here’s a small part of it at 100%:
Here’s a photo of the little rock with my iPhone to show it’s true scale:
Magnification in this case was about 1.75X larger than life size on the camera sensor.