Regarding d.o.f. calculator, I understand that as long as shooting in the same distance, same location/position, same lightning, and same DSLR body.
For example, if shooting at same focal length and same exposure :
50 mm and f/5.6 and 1/60 sec and ISO 200 (manual exposure).
50 mm f/1.8
All 5 lenses give same amount of d.o.f. (depth of field)
But the Bokeh is completely different.
Looking for a method to measure the quality of Bokeh.
A method that is objective, not subjective