Daniel, can you please clarify something for me?Your comparison examples refer to 'simulated APS-C' and one of your bullet points on your demo page indicates "same subject distance." But, don't the effects of crop factor on apparent aperture depend on maintaining the same subject framing (as opposed to the same magnification)? You are cropping images taken with the same sensor, but in reality to get the same overall framing on the 1.6x crop that you have with your FF sensor, you'd need to move the camera further from the subject.


Using DOFMaster's calculator to 'recreate' your simulation, 5D2 70mm f/4 at 10 ft has a DoF = 1.47 ft. 50D 111mm f/6.4 at 16 ft has a DoF = 1.5 ft. (and if I could select 112mm as a focal length, which is 70x1.6, it would be 1.47 ft.). So, to get the same DoF we need to mulitply focal length and aperture by 1.6x, but only if we also move further from the subject. Similarly, 50D 70mm f/4 at 16 ft has a DoF = 2.4 ft; same lens, same settings but put on a 5D2 body and moving forward to 10 ft subject distance to maintain framing, changing the aperture to f/6.4 gives a DoF = 2.35 ft.


In other words, as Bryan states, "...as a generalization, using a higher FOVCF DSLR will yield more DOF in your similarly cropped pictures because you will be farther from the subject."


Thanks!


--John