only 3:1? Yikes, I'd hate to see that at 5.
Was this focus stacked or do the images have that kind of DOF?
I know when I use my 100 at mfd, the DOF is very thin and at most 1/8".
2000 740i-Annalisa and 2008 335i-Weebl. Weebl may wobble but has DTC