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Thread: what's metering

  1. #1

    Default what's metering

    hi guys
    just wondering, what's metering and how does it work. ?

  2. #2

    Default Re: what's metering

    I generally understand metering as measuring exposure using a light meter. The light meter will give you the f-stop, ISO, shuter speed and if you do it well, you will get a perfectly exposed picture.

    How? Buy a light meter... and read the manual.

  3. #3

    Default Re: what's metering

    Metering is about measuring a scene and determining what shutter speed, aperture, etc to use loh. Not only standalone light meters, nowadays cameras all have light meters built-in mah. I believe these are called reflective light meters. While there are special light meters that measure incident light.
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  4. #4
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    Default Re: what's metering

    In very basic terms:
    Metering means to ensure that u properly expose ur scene. There are 3 kinds of mode (a) matrix metering (b) centre weighted (c) spot metering
    (a) matrix metering - normally used in landscape photography to properly expose the whole scene, the camera will determine the light across the whole picture and try to find the best setting to properly expose everything.

    (b) centre weighted - normally used in portrait setting or other scenes where there is a main object that occupies abt 70% of the picture center. The camera will try to properly expose the 70% of that picture and "ignore" the background. So for example, if ur object is black and ur background is white, the camera will meter the black object, and will try to adjust itself to bring out the black object's details. In order to do so, it got to expose more. So wat u get is a properly exposed black object against a over exposed background. Remember the background is already white, and because of the need to expose more to bring out the black details, the white background will be overexposed.
    So i think u get wat i mean, the camera will only care abt the center 70%.

    (c) spot metering - similar to the centre weighted metering, but just that in spot metering, we meter only a small spot eg. a 6mm diameter circle in the picture. This is used for example, when there is a small frog in a bright picture. if u use matrix metering, the camera will evaluate the whole scene and think that the whole picture is too bright, and hence under expose the picture to generate a proper exposure for the whole scene. But in doing so, the small frog may be further underexposed and become dark frog.
    in addition, if u use centre weighted metering, remember it assigns abt 70% to the center of the picture, but the frog is only very very small in the picture! hence the end result will also be the camera feels that the scene is too bright and underexpose.
    Thus in spot metering, u aim the center crosshair on the frog to meter the frog. This will ensure that the frog is properly exposed and be seen! but of course the background may not be properly exposed.

    In apeture priority, shutter priority and program mode, u need to select ur desired metering style: (a) matrix metering (b) centre weighted (c) spot metering and then the camera will take care of the metering, thus u just concentrate on selecting the correct apeture, shutter speed or iso value/white balance to shoot ur photo.

    But for manual mode:
    1) Switch ur camera to manual mode
    2) Select ur desired metering style: (a) matrix metering (b) centre weighted (c) spot metering
    3) if using spot metering or centre weighted metering, remember to point ur centre crosshair onto ur desired object.
    4) look into ur viewfinder and u will see a horizontal bar something like this + lllllll|llllll -
    5) what u got to do now, is to turn ur apeture dial or ur shutter dial to make sure that the horizontal bar is centered
    6) half press ur shutter release so that the exposure is locked i.e. even if u point at other places in ur scene, the metering wont change due to metering other objects.
    7) frame ur photo nicely and shoot.

    Hope u understand all that i just typed..have fun
    09 Oct 09 officially marks the date I become a canon convert.

  5. #5
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    Default Re: what's metering

    So does every cam has the metering functions?
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  6. #6

    Default Re: what's metering

    Quote Originally Posted by match80
    So does every cam has the metering functions?
    Of course, most modern camera bodies incorporate a metering system. Unless the meter in your camera is not working (some do require battery to operate), or you have one of those really old cameras.

    Metering is the vital key to properly exposed images.

  7. #7
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    Default Re: what's metering

    Wat abt FZ7? Does it have one? Or its an external one?
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  8. #8

    Default Re: what's metering

    Quote Originally Posted by match80
    Wat abt FZ7? Does it have one? Or its an external one?
    I am not sure about this camera. I believe it has one. Read your manual.
    Last edited by photobum; 11th August 2006 at 09:12 AM.

  9. #9
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    Default Re: what's metering

    Quote Originally Posted by match80
    Wat abt FZ7? Does it have one? Or its an external one?
    he already said most camera have metering... unless you tell me fz7 was bought 10+yrs ago

  10. #10

    Default Re: what's metering

    Quote Originally Posted by ExplorerZ
    he already said most camera have metering... unless you tell me fz7 was bought 10+yrs ago
    Even my 20 year-old F3 has a meter.

  11. #11

    Default Re: what's metering

    As long as there are Auto/AP/SP/etc modes means it got metering function already. The cam need to determine the shutter speed and aperture to be truly auto mah.

    So FZ7 definitely have.
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  12. #12
    Moderator catchlights's Avatar
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    Default Re: what's metering

    Polaroid cameras, disposable cameras don't come with a meter.
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  13. #13

    Default Re: what's metering

    Quote Originally Posted by catchlights
    Polaroid cameras, disposable cameras don't come with a meter.
    Oh yes... some Polaroid cameras do. A Hasselblad or Mamiya with a Polaroid back. This is still consider a Polaroid camera, right?

  14. #14

    Default Re: what's metering

    thanks all for the advice! =)

  15. #15

    Default Re: what's metering

    Quote Originally Posted by kcuf2 View Post
    In very basic terms:
    Metering means to ensure that u properly expose ur scene. There are 3 kinds of mode (a) matrix metering (b) centre weighted (c) spot metering
    (a) matrix metering - normally used in landscape photography to properly expose the whole scene, the camera will determine the light across the whole picture and try to find the best setting to properly expose everything.

    (b) centre weighted - normally used in portrait setting or other scenes where there is a main object that occupies abt 70% of the picture center. The camera will try to properly expose the 70% of that picture and "ignore" the background. So for example, if ur object is black and ur background is white, the camera will meter the black object, and will try to adjust itself to bring out the black object's details. In order to do so, it got to expose more. So wat u get is a properly exposed black object against a over exposed background. Remember the background is already white, and because of the need to expose more to bring out the black details, the white background will be overexposed.
    So i think u get wat i mean, the camera will only care abt the center 70%.

    (c) spot metering - similar to the centre weighted metering, but just that in spot metering, we meter only a small spot eg. a 6mm diameter circle in the picture. This is used for example, when there is a small frog in a bright picture. if u use matrix metering, the camera will evaluate the whole scene and think that the whole picture is too bright, and hence under expose the picture to generate a proper exposure for the whole scene. But in doing so, the small frog may be further underexposed and become dark frog.
    in addition, if u use centre weighted metering, remember it assigns abt 70% to the center of the picture, but the frog is only very very small in the picture! hence the end result will also be the camera feels that the scene is too bright and underexpose.
    Thus in spot metering, u aim the center crosshair on the frog to meter the frog. This will ensure that the frog is properly exposed and be seen! but of course the background may not be properly exposed.

    In apeture priority, shutter priority and program mode, u need to select ur desired metering style: (a) matrix metering (b) centre weighted (c) spot metering and then the camera will take care of the metering, thus u just concentrate on selecting the correct apeture, shutter speed or iso value/white balance to shoot ur photo.

    But for manual mode:
    1) Switch ur camera to manual mode
    2) Select ur desired metering style: (a) matrix metering (b) centre weighted (c) spot metering
    3) if using spot metering or centre weighted metering, remember to point ur centre crosshair onto ur desired object.
    4) look into ur viewfinder and u will see a horizontal bar something like this + lllllll|llllll -
    5) what u got to do now, is to turn ur apeture dial or ur shutter dial to make sure that the horizontal bar is centered
    6) half press ur shutter release so that the exposure is locked i.e. even if u point at other places in ur scene, the metering wont change due to metering other objects.
    7) frame ur photo nicely and shoot.

    Hope u understand all that i just typed..have fun

    Very useful info.

  16. #16
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    Default Re: what's metering

    theres one more called the zone metering...but thats more a user-worked one...tho you still need a light meter...

  17. #17
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    Default Re: what's metering

    How abt a little explaination on the zone metering to enlighten everybody ?

  18. #18
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    Default Re: what's metering

    Quote Originally Posted by stinkyfoot17 View Post
    How abt a little explaination on the zone metering to enlighten everybody ?
    well..I only heard about it...never went in depth to learn about it actually...


  19. #19
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    Default Re: what's metering

    If you want to throw your camera's metering out the door for daylight shots, use a linear polarizing filter.

    If you want your camera (digital) to not throw it out the door when using a polarizing filter, make shure it is "circular polarizing type".

    Learning why will give you some idea of how the DSLR does metering
    Time, is an effortless construction :)

  20. #20

    Default Re: what's metering

    can try to read from book to learn more, shoot more and read more will definitly help.
    Just got a book from Kinokuniya "Exposure" BY Chris Weston worth buying
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