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Thread: can take a look at my pic - what is wrong?

  1. #1
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    Default can take a look at my pic - what is wrong?

    hi guys, my gf just came back from france and she borrowed my tokina 12-24 + 400D. she took certain photos with the tokina inside a museum and it turned out like the one below. there are dark diagonal corners.

    1) no CPL was used
    2) no hood was used
    3) her hand wasn't blocking the lens
    4) she's used to using DSLRs so it's not a question of noob mistakes
    5) it only happened in pics taken in the museum and no where else.

    what could have caused this? she's as clueless as i am. thanks (:



  2. #2
    Senior Member glennyong's Avatar
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    Default Re: can take a look at my pic - what is wrong?

    something at the lens mounting ? or theres something wrong with the internal parts of the lens ?

    its definately something since i can see through the dark portions.

  3. #3
    Senior Member zac08's Avatar
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    Default Re: can take a look at my pic - what is wrong?

    There must be something physically blocking the portions that are dark, i.e. a strap or something...

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    Default Re: can take a look at my pic - what is wrong?

    it can't be the strap cos it was across her neck. plus ive seen other pics and the pattern of 'vignetting' is roughly similar. and it also cant be that it happened only in pics taken in the museum. damn strang

  5. #5

    Default Re: can take a look at my pic - what is wrong?

    Aperture blade mulfunction?

  6. #6
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    Default Re: can take a look at my pic - what is wrong?

    hmm not sure man. totally puzzling. unless there was some ghost inside the museum

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    Default Re: can take a look at my pic - what is wrong?

    Quote Originally Posted by Isaiahfortythirtyone View Post
    hmm not sure man. totally puzzling. unless there was some ghost inside the museum

    ghost give u flare... maybe its a frankenstein monster doing a 2 L frame for u...

    anyway, i also have a puzzling problem with vignetting....
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  8. #8

    Default Re: can take a look at my pic - what is wrong?

    Quote Originally Posted by ipin View Post
    Aperture blade mulfunction?
    Aperture blade will not cast a shadow.

    No CPL was used.... Was a cokin filter holder used? The blockage only at opposite corners... Plus it's not circular....... Lens didn't mount fully, ie did not click? Some lenses only have a rectangular opening, so if didn't mount fully, the image 'rectangle' (instead of circle) doesn't correspond to the sensor?

    But then again if that's the case, the lens electronics would not have worked...

    Take the lens and look through the VF while you mount it, see if you can replicate the shadows if the lens mounting did not turn fully until click.
    Last edited by lsisaxon; 17th April 2007 at 09:45 AM.

  9. #9

    Default Re: can take a look at my pic - what is wrong?

    Me think it is the lens hood....

  10. #10
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    Default Re: can take a look at my pic - what is wrong?

    Yes, is this the first time she use that lens? Looks like it as she got the lens from you.

    I don't know that lens, but if the hood is the "clickable" type, she maybe thought that it is already the max in turning and don't dare to force. Thus, it is not yet clicking thus the hood have not reached the desired position. This is more particularly so, and I bet that the hood is a petal-shaped one.
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    Default Re: can take a look at my pic - what is wrong?

    looks like lens hood to me... i get this problem with my 12-24 and d50 when i didn't lock the lens hood into place properly...

  12. #12

    Default Re: can take a look at my pic - what is wrong?

    Quote Originally Posted by michhy View Post
    Me think it is the lens hood....
    TS says no hood was used (2)..

  13. #13
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    Default Re: can take a look at my pic - what is wrong?

    Is she sure that she has no hood on?
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  14. #14

    Default Re: can take a look at my pic - what is wrong?

    My guess is lens hood also. If she was with a friend who took pictures of her, take a look at those photos and see if the lens hood was on while she was in the museum.

    Especially true if only the 12mm pictures have the vignetting, and the more zoomed in ones do not.
    Last edited by StreetShooter; 17th April 2007 at 10:04 AM.

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    Default Re: can take a look at my pic - what is wrong?

    well i guess its not the lens hood. i asked her to replicate it but she coudlnt. even with the lens hood not screwed in properly, it doesnt create such vignetting. but i'll ask her abt the hood again. heh. i also think it's the lens hood.

    there are no cokin filters as well.

    lens has to be screwed on properly else the AF wont work

    and also, it happened only in museum pics. hmm...when she took outdoors, it had no such problem

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    Default Re: can take a look at my pic - what is wrong?

    Maybe not so prominent. Cos the museum less light, so the vignetting problem will be amplified.
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  17. #17

    Default Re: can take a look at my pic - what is wrong?

    Quote Originally Posted by Isaiahfortythirtyone View Post
    well i guess its not the lens hood. i asked her to replicate it but she coudlnt. even with the lens hood not screwed in properly, it doesnt create such vignetting. but i'll ask her abt the hood again. heh. i also think it's the lens hood.
    Look like the hood is screwed on slanted ...
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  18. #18

    Default Re: can take a look at my pic - what is wrong?

    Quote Originally Posted by Isaiahfortythirtyone View Post
    well i guess its not the lens hood. i asked her to replicate it but she coudlnt. even with the lens hood not screwed in properly, it doesnt create such vignetting. but i'll ask her abt the hood again. heh. i also think it's the lens hood.

    there are no cokin filters as well.

    lens has to be screwed on properly else the AF wont work

    and also, it happened only in museum pics. hmm...when she took outdoors, it had no such problem
    Then I also think it's highly likely the hood too.. And when she try to replicated, she didn't zoom out all the way? Maybe should shoot a picture also because the VF view is usually smaller that what the sensor covers.
    Last edited by lsisaxon; 17th April 2007 at 02:43 PM.

  19. #19

    Default Re: can take a look at my pic - what is wrong?

    Quote Originally Posted by Andy Ang View Post
    Maybe not so prominent. Cos the museum less light, so the vignetting problem will be amplified.
    Walao... that's is not vignetting.. it's the whole thing being blocked!

  20. #20

    Default Re: can take a look at my pic - what is wrong?

    seen these b4, has this occurred to any other frame... looks to me seriously like a failing shutter curtains.

    If it does occur on other frame, pls send ya camera to Canon for checking.

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