Bridgeman wrote:
The DOF will be different on a full frame sensor vs. a cropped sensor, even when using the same lens with the same settings. This is because of the Circle of Confusion (CoC) factor, which is different for the two types of sensors. (.02501 on full frame and .019948 on cropped sensors) This does not seem like much, but makes a differance. Probably more so in close up and macro shots. The CoC changes the Hyperfocal Distance, thus changes the DOF. Although I knew what DOF was, I did not understand how it changed. So, I did some research. One site that was really helpful was posted recently, camersdojo/2011/07/08/how-to-calculate-depth-of field. Helped me a lot in understanding DOF. Now to take this knowledge to the field and take better photos!!
The DOF will be different on a full frame sensor v... (
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DOF is determined strictly by relationship of aperture to lens length, in any given lens. This is a mathematical principle, regardless of film grain or sensor pixel density. DOF will be the same for all lenses of same length at same f/stop, regardless of lens manufacturer. Neither ISO nor CoC have any bearing on DOF.
Any given lens used on an 8x10, 4x4, 6x7, 6x6, 135, 126, etc. film cameras, or DX, FX, 4/3, or any DSLR camera, will result in exactly the same DOF.