I found there this comparison of depth-of-field of two cameras, one of which has a sensor which is half the size of the other, linearly (and therefore half the focal length in corresponding lenses). This shows clearly how huge an impact format has on depth-of-field.
Very interesting - and great reading. The longer focal length lens indeed can render shallower DOF than the 'wider' angle lands on the other camera. All this also has a lot to do with diameter of the lens (glass) itself as well as the front element in the group. Thanks - interesting indeed.
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