Depth of field preview does work in all the modes the manual says it does, and when set to auto focus. Except when at the shortest focal length (28mm) it doesn't give a preview when the aperture is wide open, f2.8, OR when the lens is at 200mm it won't give a preview at f3.5.
Adjust the aperture and/or the shutter speed, depending which mode you are in.
Stevekin.
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