Weirdest thing. I passed the website dpreview.com, and saw a mention of a lens. Now, I don't remember the exact wording, but it said something like "This lens has a Depth-of-Field Scale, but it is calibrated for fullframe, so it will be of no use to most users." NB: the above was written by an editor in a review. This was not a random user comment. I am so sorry I can't link to it, but I don't remember which review it was. Now... I am not an optics expert, but I do belive that a given lens at a given aperture and focused at a given point, will have exactly the same depth of field no matter the type or size of photosensitive material behind it. What am I missing?