*DUMB* noon questions about metering with a Canon 400d..

Discussion in 'Canon' started by the_niner_nation, Jun 4, 2007.

  1. Forgive me in advance if these question(s) are really dumb, but I am really
    working my head around trying to understand photography and my DLSR ( canon
    400d).

    Oftentimes, people will say " meter the light " from your camera , or "
    take a meter reading" from your camera...

    how exactly do you do that? where on my camera would this information be
    displayed? is my camera capable of outputting light readings?

    also, I know the 400d offers 3 metering modes..evaluative, partial and
    centre-weighted?

    Sometimes I see people's photos posted online with technical data attached
    that shows metering as 'matrix' ...I have no idea what this means..


    my only real understanding of metering is that the exposure is based upon
    what the metering modes are selected..

    again, please forgive me if these are really dumb questions.

    Thanks!
     
    the_niner_nation, Jun 4, 2007
    #1
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  2. the_niner_nation

    Paul Furman Guest

    I'm not familiar with Canon but probably if you adjust exposure
    compensation +/1 you will see a volume type meter in the viewfinder
    indicating how far above/below 'correct exposure' you are. Certainly
    this will show in manual mode, and probably in A, S & P mode.

    My old Canon AE1 film camera had a needle that swung back & forth in the
    viewfinder. I'd set the aperture & adjust shutter to center the needle.
    It was pretty easy really.
     
    Paul Furman, Jun 6, 2007
    #2
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  3. the_niner_nation

    Androo Guest

    Oftentimes, people will say " meter the light " from your camera , or "
    When you half press the shutter, you see the aperture and shutter speed
    displayed in the viewfinder and on the LCD. This, in effect, is the meter
    reading. So you can point the camera at something and see what the correct
    exposure should be for, say, somebody's face. It might be useful to get
    close to something in a difficult scene and take a reading like this because
    when you back up and look at the whole scene, the camera may get the
    exposure wrong. This is when you'd go into manual mode.

    If you do the half press in manual mode it's a bit different, by the way. To
    get a correct reading, you have to adjust the aperture and/or shutter speed
    so the pointer in the display moves to the centre of the scale.

    Androo
     
    Androo, Jun 6, 2007
    #3
  4. the_niner_nation

    newsmb Guest

    If you want to get a meter reading, just set the exposure level to A,
    S or P and record the shutter speed, aperture and ISO. That's it,
    basically. The trick is to know exactly what's being measured. :)

    'Evaluative' is usually what you want to use. The camera takes
    readings from a large number of small areas in your frame, then does a
    complicated statistical analysis to determine the correct exposure.
    Nilon's 'matrix' metering is essentially the same thing.

    'Center weighted' reads the incidental light from the entire frame, as
    well as the reflected light from an imaginary circle in the the center
    and averages the result with more "weight" placed on what is in the
    circle.

    'Partial' (I believe) reads only the reflected light in an imaginary
    circle. This is useful when you're in mixed lighting situations,
    because you can get a reading off a grey card (green grass or old
    asphalt works fine if you don't have one) and get a perfectly correct
    exposure.
     
    newsmb, Jun 6, 2007
    #4
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