20D Spot Metering

Discussion in 'Digital Cameras' started by Charles Dickens, Nov 12, 2004.

  1. As the 20D does not have spot metering, does it work to zoom in, take the
    meter, then zoom out and take the pic?
     
    Charles Dickens, Nov 12, 2004
    #1
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  2. Charles Dickens

    Mike Guest

    You're freakin' kidding me??
    If true, an attempt to leave a last gasp of air in the more expensive
    models.

    "Charles Dickens" <> wrote in message
    news:cn2rvj$7fu$...
    > As the 20D does not have spot metering, does it work to zoom in, take the
    > meter, then zoom out and take the pic?
    >
    >
     
    Mike, Nov 12, 2004
    #2
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  3. Hello Mike.

    Well, I thought this would be the case, and so I didn't mention the
    following fact, so it didn't bias the reply:

    "Many modern zoom lenses (including some of Canon's) are variable aperture
    zooms, and this method won't work with such lenses as you have metered at a
    different aperture to the one you'll be taking the photo at. The technique
    will only work if you use a constant-aperture zoom (such as Canon's L
    series)."


    "Mike" <> wrote in message
    news:zJ6ld.24592$V41.10880@attbi_s52...
    >
    > You're freakin' kidding me??
    > If true, an attempt to leave a last gasp of air in the more expensive
    > models.
    >
     
    Charles Dickens, Nov 12, 2004
    #3
  4. Charles Dickens

    Mike Guest

    I don't see why the firmware can't compensate depending on what lens it
    sees, especally if it's a kit lens or another lens designed in tandem with
    the camera. I guess zoom/exposure-hold/unzoom (suitable only for the most
    dextrous walkers+gum-chewers) or a best-guess exposure compensation is the
    way to go then...
    But I agree, why let a few good facts get in the way of a rant that's
    probably true anyway :)

    "Charles Dickens" <> wrote in message
    news:cn2tfj$nb5$...
    > Hello Mike.
    >
    > Well, I thought this would be the case, and so I didn't mention the
    > following fact, so it didn't bias the reply:
    >
    > "Many modern zoom lenses (including some of Canon's) are variable aperture
    > zooms, and this method won't work with such lenses as you have metered at
    > a
    > different aperture to the one you'll be taking the photo at. The technique
    > will only work if you use a constant-aperture zoom (such as Canon's L
    > series)."
    >
    >
    > "Mike" <> wrote in message
    > news:zJ6ld.24592$V41.10880@attbi_s52...
    >>
    >> You're freakin' kidding me??
    >> If true, an attempt to leave a last gasp of air in the more expensive
    >> models.
    >>

    >
    >
     
    Mike, Nov 12, 2004
    #4
  5. Charles Dickens wrote:
    > "Many modern zoom lenses (including some of Canon's) are variable aperture
    > zooms, and this method won't work with such lenses as you have metered at a
    > different aperture to the one you'll be taking the photo at. The technique
    > will only work if you use a constant-aperture zoom (such as Canon's L
    > series)."


    Since the 20D "knows" the lens's maximum aperture at any focal length,
    it *can* reliably meter a scene with a variable aperture zoom.

    -Dave
     
    Dave Herzstein, Nov 12, 2004
    #5
  6. Charles Dickens

    John Doe Guest

    It does have spot metering it just isn't as small a spot as what people are
    used to. It is 9% instead of 2 or 3%.

    John


    "Charles Dickens" <> wrote in message
    news:cn2rvj$7fu$...
    > As the 20D does not have spot metering, does it work to zoom in, take the
    > meter, then zoom out and take the pic?
    >
    >
     
    John Doe, Nov 12, 2004
    #6
  7. Charles Dickens

    Ryadia Guest

    "Randall Ainsworth" <> wrote in message
    news:121120041924255093%...
    > In article <cn2rvj$7fu$>, Charles Dickens
    > <> wrote:
    >
    > > As the 20D does not have spot metering, does it work to zoom in, take

    the
    > > meter, then zoom out and take the pic?

    >
    > Why do you people think you need a spot meter for doing color
    > photography?


    Why Randall...
    It should be obvious even to you that metering the point you wish to capture
    when using a camera with limited contrast range is a most essencial process
    to obtain a correct exposure of at least that part of the scene you consider
    important. Of course B&W shooters don't need such precise control over their
    shots... They just leave 'em in the dektol longer!

    Douglas
     
    Ryadia, Nov 13, 2004
    #7
  8. Charles Dickens

    Skip M Guest

    "Ryadia" <no.nospam@thisboy> wrote in message
    news:Tsfld.34314$...
    >
    > "Randall Ainsworth" <> wrote in message
    > news:121120041924255093%...
    >> In article <cn2rvj$7fu$>, Charles Dickens
    >> <> wrote:
    >>
    >> > As the 20D does not have spot metering, does it work to zoom in, take

    > the
    >> > meter, then zoom out and take the pic?

    >>
    >> Why do you people think you need a spot meter for doing color
    >> photography?

    >
    > Why Randall...
    > It should be obvious even to you that metering the point you wish to
    > capture
    > when using a camera with limited contrast range is a most essencial
    > process
    > to obtain a correct exposure of at least that part of the scene you
    > consider
    > important. Of course B&W shooters don't need such precise control over
    > their
    > shots... They just leave 'em in the dektol longer!
    >
    > Douglas
    >
    >

    Unless you're shooting black and white digital. Then it would be nice if
    the 20D had a proper spot meter...

    --
    Skip Middleton
    http://www.shadowcatcherimagery.com
     
    Skip M, Nov 13, 2004
    #8
  9. Charles Dickens

    John Doe Guest

    Probably because on a number of occasions it has proven to the best way to
    get the shot I wanted. Especially in back lit situations and the like. Just
    because you don't use it doesn't others don't or don't want the feature. The
    world doesn't revolve around one or two people that feel they are THAT
    special.

    John


    "Randall Ainsworth" <> wrote in message
    news:121120041924255093%...
    > In article <cn2rvj$7fu$>, Charles Dickens
    > <> wrote:
    >
    >> As the 20D does not have spot metering, does it work to zoom in, take the
    >> meter, then zoom out and take the pic?

    >
    > Why do you people think you need a spot meter for doing color
    > photography?
     
    John Doe, Nov 13, 2004
    #9
  10. Charles Dickens

    John Doe Guest

    Well, ain't that special!

    John


    "Randall Ainsworth" <> wrote in message
    news:121120042151567469%...
    > In article <Tsfld.34314$>, Ryadia
    > <no.nospam@thisboy> wrote:
    >
    >> Why Randall...
    >> It should be obvious even to you that metering the point you wish to
    >> capture
    >> when using a camera with limited contrast range is a most essencial
    >> process
    >> to obtain a correct exposure of at least that part of the scene you
    >> consider
    >> important. Of course B&W shooters don't need such precise control over
    >> their
    >> shots... They just leave 'em in the dektol longer!

    >
    > I believe in spot meters for doing B&W as per the Zone System, but for
    > color work regardless of the media I've always preferred a simple
    > reflected or incident meter (depending on conditions).
     
    John Doe, Nov 13, 2004
    #10
  11. Charles Dickens

    DHB Guest

    On Sat, 13 Nov 2004 06:20:49 GMT, "John Doe" <>
    wrote:

    >Probably because on a number of occasions it has proven to the best way to
    >get the shot I wanted. Especially in back lit situations and the like. Just
    >because you don't use it doesn't others don't or don't want the feature. The
    >world doesn't revolve around one or two people that feel they are THAT
    >special.
    >
    >John
    >
    >
    >"Randall Ainsworth" <> wrote in message
    >news:121120041924255093%...
    >> In article <cn2rvj$7fu$>, Charles Dickens
    >> <> wrote:
    >>
    >>> As the 20D does not have spot metering, does it work to zoom in, take the
    >>> meter, then zoom out and take the pic?

    >>
    >> Why do you people think you need a spot meter for doing color
    >> photography?

    >


    Likely the reason that a smaller spot meter was not offered is
    because they thought the wider spot to be more useful to "most" people
    who would be most likely to buy the 20D. Additionally, the viewfinder
    accuracy tolerances might need to be tighter than they now are if a
    smaller spot meter was used.

    If people have the extra money & want a DSLR with a smaller
    spot meter, Canon makes them. If you can afford those DSLR's, you can
    probably afford very long "L" glass lenses & might want to take a
    picture of a small darkly colored bird against a bright background or
    the reverse. This would require a small spot metering mode & a very
    accurate DSLR viewfinder, do some tests & you may find that your DSLR
    viewfinder accuracy is less than perfect. This is probably much more
    the case on my humble Digital Rebel/300D, least expensive Canon DSLR
    because it employs a mirror system instead of instead of a prism.

    This is just my viewpoint/opinion but I think it's reasonable.
    Also spot metering is largely a specialty function that "most" people
    have "little" need of. Don't misunderstand, I wish my DSLR had this
    feature but I have learned to work around it, though there are a few
    shots I have missed because I did not have this feature. Let's hope
    that the "30D" or whatever replaces the 20D will have a tighter spot
    meter, but I suspect Canon won't go for anything smaller than 9-7%!

    Respectfully, DHB

    "To announce that there must be no criticism of the President,
    or that we are to stand by the President, right or wrong,
    is not only unpatriotic and servile, but is morally treasonable
    to the American public."--Theodore Roosevelt, May 7, 1918
     
    DHB, Nov 13, 2004
    #11
  12. Charles Dickens

    MarkH Guest

    "Charles Dickens" <> wrote in news:cn2rvj$7fu$1
    @news8.svr.pol.co.uk:

    > As the 20D does not have spot metering, does it work to zoom in, take the
    > meter, then zoom out and take the pic?


    This may not be how you want to do things so please feel free to ignore:

    I have found the easiest way to accurately meter is to click the shutter
    button fully and then use the review with info (this takes very little
    time). You then get the option of dialling in some compensation or going
    to 'M' and using whatever settings you want to get more/less exposure.

    Once you have your shot then you can review and check info again, it should
    be close and taking another shot is quick and easy if you want to try
    again.

    I believe that it is the lack of being able to do things this way that
    brought about the need for various light meters to get the shot right
    without experimenting. Similarly bracketing is more important with film,
    with digital you can just check and try again.

    If I am having trouble metering for motorsports (like when cars are coming
    towards me with headlights on) then I use M, check the info between cars
    and adjust as needed. As long as the lighting doesn't change from shot to
    shot then this works fine.



    --
    Mark Heyes (New Zealand)
    See my pics at www.gigatech.co.nz (last updated 12-Nov-04)
    "There are 10 types of people, those that
    understand binary and those that don't"
     
    MarkH, Nov 13, 2004
    #12
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