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


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Isaiahfortythirtyone

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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 :)


 

glennyong

glennyong

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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.
 

zac08

zac08

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

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Isaiahfortythirtyone

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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 :think:
 

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ipin

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Aperture blade mulfunction? :think:
 

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Isaiahfortythirtyone

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

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lsisaxon

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ipin said:
Aperture blade mulfunction? :think:
Click to expand...
Aperture blade will not cast a shadow. :think:

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... :dunno:

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.
 

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michhy

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Oct 21, 2005
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Me think it is the lens hood....
 

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Andy Ang

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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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ExplorerZ

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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... :dunno:
 

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StreetShooter

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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.
 

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Isaiahfortythirtyone

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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 :think:
 

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Andy Ang

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

megaweb

megaweb

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Isaiahfortythirtyone said:
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.
Click to expand...
Look like the hood is screwed on slanted ...
 

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lsisaxon

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Isaiahfortythirtyone said:
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 :think:
Click to expand...
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? ;p Maybe should shoot a picture also because the VF view is usually smaller that what the sensor covers.
 

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lsisaxon

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Andy Ang said:
Maybe not so prominent. Cos the museum less light, so the vignetting problem will be amplified.
Click to expand...
Walao... that's is not vignetting.. it's the whole thing being blocked!
 

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oeyvind

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Feb 25, 2002
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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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