Quote Originally Posted by Greg Miller View Post
This is not true at all. DOF is dependent on 3 things: focal length of the lens, the f-stop, and camera-to-subject distance. The capture media is not a factor when sensor size equals film size. In a cropped sensor, DOF actually increases if field of view is matched (because focal length changes; it still has nothing to do with capture media - you could accomplish the same change in DOF by capturing on film using the same focal length and then cropping the image).
I think Yardley is referring to the idea that film grain is thicker and more uneven than the photosites on a digital sensor, and that film therefore captures (marginally) more of the "spread" of the focus and so gives the impression of more depth of field.

I don't know if this is true. Sounds somewhat plausible theoretically but like many things, I've read about it on the net and never seen it demonstrated.