What the reviewers don't view...

Discussion in 'Australia Photography' started by Focus, May 22, 2008.

  1. Focus

    Focus Guest

    It was a 400.- Canon 17-85 IS lens. Hardly a piece of crap, I think, but I
    don't know how much Canon charges for crappy lenses ;-)

    The "stuck blades" theory would be something, but I don't think so.
    Stray light is so far fetched: I don't wear glasses and then it should be
    evident in other photo's with other camera's, which is not the case...

    Blaming the camera is the only option after ruling all others out.
    You do know what "trial and error" means, don't you?
     
    Focus, May 23, 2008
    #21
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  2. I've used the 40D and all the latest slew of released DSLRs except the
    1Ds MkIII.

    Focus is reporting something which happens when the focus point shifts
    in matrix metering. Focus may decide it is on a dark area, or a light
    area, which happen both to be at a distant point (like cliffs/sea).
    Depending on which focus sensor is locked on, even if the focus does not
    change, the exposure can change.

    In my experience, especially with the Canon 400D, the result can be
    extreme. It is as if the camera is using a spot metering from the
    selected point. The 40D is not as extreme in effect and nor is the 450D.
    The Sony/Minolta system is more like a gentle bias, it does still affect
    the exposure but is weights it rather than changes it. Also, the Sony AF
    module is less volatile in trying to find the right focus point, and
    sticks more stubbornly to the obvious central spot.

    The Nikon D300 and D3, when put into 51-zone or 15-zone modes, are also
    prone to unexpected changes in exposure as a subjecty moves across the
    field of view, depending on how well the tracking works.

    If you want consistent exposurem, don't use matrix/evaluative/multizone
    metering as small changes in composition can make big changes in exposure.

    David
     
    David Kilpatrick, May 23, 2008
    #22
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  3. Focus

    OldBoy Guest

    Full EXIF data could solve the mystery :)
    Phil Harvey's ExifView give 230+ exif-entries on 40D CR2 files.
    "Measured EV" included.
    http://freeweb.siol.net/hrastni3/foto/exif/exiftoolgui.htm
     
    OldBoy, May 23, 2008
    #23
  4. Focus

    Focus Guest

    I hardly think I want to go thru all that trouble just to make a picture
    work.
    Besides, I'm not alone in this. If you look in the Dutch group, a guy named
    Cor made very good bird pictures with a Sony A200. For some reason he
    changed to a Canon 40D and now his story is complete.
    In short, he wrote he had the 40D for one week and wasn't able to make ONE
    good shot!
    In that week he already had dust on the sensor, that had to be removed by
    the dealer, who charged him 30 euro for it.
    He's looked in plenty of forums and other people told him to under expose by
    2 clicks and always leave the WB on "clouds".
    His frustration is now so big, that he's thinking of giving up photography
    in total. Which would be a shame, because he's very good, specially for
    someone that only started a few months ago. Many would not get those kind of
    pictures even after years.

    For me it's evident the 40D has some very, very serious exposure problems.
    The only pictures I got, that were really good, were photos taken in dark
    places. I'll post some, if anybody is interested.
    But keep it out from the sun....
    BTW: I know you have the 40D, why don't you show us some pictures of a
    bright sunny day? And don't forget the EXIF, LOL.
     
    Focus, May 23, 2008
    #24
  5. No surprise here. His major miscalculation was not getting the PVC plug-in
    for CS3. All US users of the 40D have found the "Roger Rabbit" color pallet
    makes the best 16-color animations.



    Rita
    --
    Stamping out Internet stupidity one idiot at a time. Never empower the
    idiot, embrace it and stimulate it. For more details go to the Usenet
    Stimulus Project page.

    http://ritaberk.myhosting247.com
     
    Rita Berkowitz, May 23, 2008
    #25
  6. Focus

    Frankster Guest

    Interesting thread. Regardless of the technical explanation, it would be
    annoying to encounter these fluctuations. I suppose this could be a vote for
    Manual Mode, but... it would be nice if the auto-metering modes worked as
    well as possible too.
    These examples seem to corroborate David Kilpatrick's post (partially quoted
    below).
    In the examples above (shiny water reflections) it is very likly that
    David's explanation would be emphasized. One shot focused on a less
    reflective spot and one on a more reflective spot.

    -Frank
     
    Frankster, May 23, 2008
    #26
  7. Focus

    Annika1980 Guest

    Annika1980, May 23, 2008
    #27
  8. Focus

    Dica Photo Guest

    "Annika1980" <> schreef in bericht
    Here ya go:

    http://www.pbase.com/bret/image/95592163

    http://www.pbase.com/bret/image/95595521

    http://www.pbase.com/bret/image/95582285

    http://www.pbase.com/bret/image/95351647

    http://www.pbase.com/bret/image/93520480

    http://www.pbase.com/bret/image/91573202

    Perhaps your 40D didn't come with an owner's manual?



    Bert isn't capable to photograph.................................not now,
    not in the future.

    He blames it on all his camera's.

    Lol
     
    Dica Photo, May 23, 2008
    #28
  9. Overlaying the 2 images shows that they were never taken from
    the same place --- and yes, EXIF is trivial to change. But maybe
    you just were shooting from a quick moving train or car.

    http://weissel.smugmug.com/photos/300140257_bLSbk-X3.jpg

    As you can see, if you align the 2 images on the white-bordered
    area (including the masts and the outcrop), the rest stays
    unaligned.

    Also, one can easily see that the shots differ a lot in
    sharpness --- even downsamples as they are.
    --- why is this "Focus"-girl telling such obvious untruths,
    which are so easy shown to be wrong?
    Nope.
    I *have* heard of cameras that adjust their exposure depending on
    the light coming in through the lens. Maybe Canon snuck such a
    feature into your camera without telling you.
    Typical north-of-Tropic of Cancer provincialism.
    Yes, some idiot behind the camera did something wrong. As usual,
    said idiot pins it on the camera who did just as ordered ---
    and said idiot also lied about what he did.
    Try oil colours. Or better don't --- they do not arrange
    themselves into a picture without a lot of manual intervention
    with a brush and so on. Obviously, oil colours are clearly bad.

    -Wolfgang
     
    Wolfgang Weisselberg, May 23, 2008
    #29
  10. That's why they always return to Nikon: they have made their
    pallet, now they can lie in it --- and anyway, 12 colours is
    *so* *much* better than 16.

    -Wolfgang
     
    Wolfgang Weisselberg, May 23, 2008
    #30
  11. Focus

    Focus Guest

    Go suck a bus, jack ass..
     
    Focus, May 23, 2008
    #31
  12. Focus

    Focus Guest

    Here ya go:

    http://www.pbase.com/bret/image/95592163

    http://www.pbase.com/bret/image/95595521

    http://www.pbase.com/bret/image/95582285

    http://www.pbase.com/bret/image/95351647

    http://www.pbase.com/bret/image/93520480

    http://www.pbase.com/bret/image/91573202


    Still not one with the sun even close..

    So where did you steal these from?
     
    Focus, May 23, 2008
    #32
  13. Focus

    Dica Photo Guest

     
    Dica Photo, May 23, 2008
    #33
  14. Focus

    Noons Guest

    Frankster wrote,on my timestamp of 24/05/2008 12:04 AM:
    Nikon's focusing/metering does that as well.
    It's most annoying, too...
     
    Noons, May 24, 2008
    #34
  15. Poooor Focus.
    Did I touch a nerve?

    -Wolfgang
     
    Wolfgang Weisselberg, May 24, 2008
    #35
  16. Focus

    Dudley Hanks Guest

    Sometimes, an old rule of thumb like the sunny 16 will work betterr than the
    latest electronic circuitry.

    Take Care,
    Dudley
     
    Dudley Hanks, May 24, 2008
    #36
  17. Focus

    ben brugman Guest

    Problem is that you need a very advanced lightmeter to determine when the 16
    sunny works better than the latest electronic circuitry. Because if you you
    this rule in most situations the electronic circuitry will do a better job
    than the sunny 1 rule.
     
    ben brugman, May 24, 2008
    #37
  18. Focus

    Dudley Hanks Guest

    I've never had much problem with the rule. Still, if you aren't happy with
    the results your camera's meter is giving you, try the rule. It's amazing
    how often it works.

    Besides, if your camera is in manual mode, and if you take a picture with a
    digital camera, and if you check your histogram / blink mechanizm, and if
    you don't like the results, just adjust the speed or aperture accordingly.
    The results of the next pic will probably be more satisfactory than relying
    on a matrixed metering system that seems to randomly pick points to meter.

    Take Care,
    Dudley
     
    Dudley Hanks, May 24, 2008
    #38
  19. Focus

    Annika1980 Guest

    They were all taken on bright sunny days. What else did you want?
     
    Annika1980, May 24, 2008
    #39
  20. Focus

    Focus Guest

    Sunny sky in the front.

    http://www.pbase.com/bret/image/95592163
    *Sky is in the back*, no detail in shadow and the white clothes are washed
    out.

    http://www.pbase.com/bret/image/95595521
    *No sky* and the dog's neck hairs are washed out, so is it's left behind
    leg.


    http://www.pbase.com/bret/image/95582285
    The only one with good lighting, but again: *no sky!*


    http://www.pbase.com/bret/image/95351647
    Sun in the back again...


    http://www.pbase.com/bret/image/93520480
    this is not even a 40D picture and the noise and detail is horrible.


    http://www.pbase.com/bret/image/91573202
    Nice picture but *without sky.*

    Difficult concept, huh?

    The only pictures of you that are reasonable, are flash pictures...
     
    Focus, May 24, 2008
    #40
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