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


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Jul 17, 2005
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Clementi
#1
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

Senior Member
May 2, 2004
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#2
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

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Feb 21, 2005
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#3
There must be something physically blocking the portions that are dark, i.e. a strap or something...
 

Jul 17, 2005
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Clementi
#4
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:
 

ipin

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Nov 21, 2005
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#5
Aperture blade mulfunction? :think:
 

lsisaxon

Senior Member
Nov 29, 2004
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#8
Aperture blade mulfunction? :think:
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.
 

michhy

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Oct 21, 2005
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#9
Me think it is the lens hood....
 

Andy Ang

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Jan 10, 2006
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#10
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.
 

StreetShooter

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Jan 17, 2002
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#14
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.
 

Jul 17, 2005
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Clementi
#15
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:
 

megaweb

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Jan 17, 2002
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#17
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 ...
 

lsisaxon

Senior Member
Nov 29, 2004
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#18
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:
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.
 

lsisaxon

Senior Member
Nov 29, 2004
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#19
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!
 

oeyvind

Senior Member
Feb 25, 2002
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#20
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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