What does auto mean when using long zooms?

Discussion in 'Digital Photography' started by Click, Sep 17, 2003.

  1. Click

    Click Guest

    When using a camera like the Olympus C-750 does automatic mode extend to
    both aperture & shutter speed? I mention this camera because it has a 10 x
    zoom. To have any change to getting a good picture you would need a very
    fast shutter to minimize movement. This means that you will need a very
    wide aperture. Is this what the auto mode does?
    Click, Sep 17, 2003
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  2. Aah, the classic dilema of a photographer using zoom lenses.

    The Aperture and shutterspeed are reciprocally related. i.e if
    one increase the other decreases and vice-versa at constat exposure.

    Also Max. apperture of a medium quality zoom lens varies over the focal
    length of the zoom.
    i.e. if your focal range is from say 50-500 mm (10x) , The max apperture
    at 50mm could be 3.5 and at 500 mm 5.6.
    And most of these zooms don't perform well at the tele end, when wide
    open, So in this case to get any sort of decent picture at 500mm, the
    aperture would need to be stopped down to f/8 or f/11. And this will no
    doubt increase the shutter time.

    Auto mode, determines the amount of exposure reqd for your shot and
    decides on the best possible shutter-speed and aperture. But this
    doesn't mean It will optimise both of them. either it will select a wide
    aperture, which would mean a soft picture (See exp. above) or a slow
    shutter speed which would require a tripod.

    Any zoom with a range > 3x is almost unusable at the tele or wide end at
    max aperture. You need to step down at least 2 stops , which means a
    slower shutter speed.
    Bhaskar Karambelkar, Sep 18, 2003
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  3. Click

    Ray Fischer Guest

    I'd guess that most cameras that do automatic will try for as fast a
    shutter speed as possible give the limitations of lens and light.
    Ray Fischer, Sep 18, 2003
  4. Click

    Tom Oehser Guest

    I think what Susan meant to say is that if you are considering such a
    purchase, you surely are reading reviews, such as the ones at
    www.steves-digicams.com, www.dcresource.com, and
    www.imaging-resource.com, and/or looking at the manufacturers specs
    and manuals at www.olympus.com, and if you are reading that stuff, why
    ask here, since you already know the difference between the Program
    mode, the Automatic mode, the Aperature-Priority mode, the
    Shutter-Priority mode, and the Manual mode. Of the C-750. A guess
    isn't really necessary, given that the question was framed as "...
    does automatic mode extend to ...", the querant clearly is not
    discriminating between the umpteen different automatic modes, and is
    almost certainly not referring to what the camera calls "full
    automatic mode" or whatever, therefore, the straightforward answer
    would be "yes and no" or "sometimes" or "it depends" or "RTFM".

    Tom Oehser, Sep 25, 2003
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