Originally Posted by
Brian Vuillemenot
I'm surprised no one has added in the depth of field disadvantage you put yourself in as format size goes up. You have to stop down more and more with a given angle of view as the camera size increase to get the same depth of field. For example, a normal lens for 4X5 is 150mm; for 8X10, 300mm; and for 11X14, 450mm. The 450mm lens has far less depth of field at a the same f stop than the 150! With many subjects, even with movements it may not be possible to get everything in focus.
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