[nobody23]

http://www.dofmaster.com/dofjs.html

400mm an APS-C

Subject distance 3 m

Depth of field
Near limit 2.99 m
Far limit 3.01 m
Total 0.01 m

In front of subject 0.01 m (50%)
Behind subject 0.01 m (50%)


2cm sind halt nicht soviel.