Incident-light meter - Wide angle and Telephoto

Discussion in '35mm Cameras' started by Jack, Jul 3, 2005.

  1. Jack

    Jack Guest

    When using an incident-light meter, holding it at or near the subject and
    aiming the meter's light-sensitive cell back toward the camera.
    I notice a difference when shooting at 10 ft and when shooting at 20 ft.
    Say when shooting at 10 ft with a wide angle lens I need to give it f8 but
    when taking the same
    shoot from 20 ft with a telephoto lens the shot is under exposed.

    Is this a known problem or am I doing something wrong?

    Jack, Jul 3, 2005
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  2. You need to check you lenses and see if they are performing properly.
    Perhaps one of them has a sticky diaphragm.
    Incident meters measure light falling on a subject which is obviously
    independent of the camera and lens.
    Do a test, set you lens to a fixed stop (say f8) and shoot a uniform
    subject like a blank wall. Make sure your autoexposure is off.
    Fill the frame with the subject.
    Now do the same thing for your other lens. Same f stop, but move the
    camera to get the same image captured.
    You can repeat for several other f stops (like f16) if you wish.
    If there is any difference between the exposures then you have a
    mechanical problem.
    Robert Feinman, Jul 3, 2005
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