Quote Originally Posted by Thomas Bertilsson View Post
Think about what you're saying here. The Contax normal lens is 80mm? At f/2 that's a 40mm aperture. If you use a 50mm lens at f/1.2 you have the same depth of field, because that's also a 40mm aperture. Exactly.
Assuming 20/20 visual acuity for the observer,...
  • 645 format 80mm f/2 focused at 10m has DOF zone of 1.15m
  • 135 format 50mm f/1.2 focused at 10m has DOF zone of 1.02m

4.7" shallower DOF zone for the 135 format shot with those two lenses.