Actually those DOF numbers don't apply to real life, because if you were to compare different formats using the same focusing distance you have to use different focal lengths to get the same picture. Using DOF Master; 1.6 crop sensor, 50mm at f/1.2 has 6.51" of DOF at 10'. Full frame, 80mm at f/1.2 has 3.97" DOF at 10'. If you were to use the same lens and get closer with the FF you would get the exact same DOF as with using different focal lengths.


The only time you use that formula if you are focus calibrating your camera/lens combo, then 1.6 has thiner DOF.


John.