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Message: <blockquote data-quote="Geoffc" data-source="post: 255320" data-attributes="member: 8705">You are technically correct, but not correct in real world practice for the following reason. Standing the same distance (as photographers do) from the subject with DX and FX you need 50% more focal length to put the same image in the viewfinder/sensor. So where a DX has a 50mm lens the FX would need 75mm to create exactly the same image on the sensor. The longer focal length at the same aperture and camera to subject distance equals reduced depth of field. This is why people say FX has less DOF.This became very obvious to me when I first got my FX body. I would sit in my chair in the house taking the same pics of the kids etc as I used to with the D300 DX body. I was framing the images in a similar way which required more zooming in. I found that I was missing focus a lot more because of the reduced DOF. I'm now much more accurate with where I focus.</blockquote>