...this for Pedants everywhere, for those slow days...
Don't know if you've ever been to dofmaster.com which among other things has an online depth of field calculator, into which you enter camera model, lens focal length, lens f No and subject distance and it calculates the resulting depth of field.
Sony RX100
focal length 10.4mm, f1.8, subject at 3 inches results in DOF of 0.32 inches.
Hmm I thought not much room for error, until I tried it for a
Leica M9
focal length 28mm, f1.4, subject at 3 inches results in DOF of 0.02 inches.
Also the sheer number of cameras in the list certainly results in a :wtf: moment.
Ee, sonny, when I were a lad it was a choice of a Pentax SV, a Nikon F or a Kodak Instamatic.