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Message: <blockquote data-quote="Joseph Bautsch" data-source="post: 5365" data-attributes="member: 654"><p>The DOF is a function of f/stop and focal length. The DOF range gets shallower as the focal length gets longer. If you are using a DOF calculator then it should have a place to enter the focal length. The focal length to use is the one the lens is zoomed to. If a 70-300mm lens is zoomed to 200mm then use that in the calculations. If it's zoomed to 125mm then use that number. As far as the hyperfocal distance and circle of confusion is concerned I would recommend getting a good handle on using and understanding DOF first. Hope this helps.</p></blockquote><p></p>