Incense

by Bart Arondson

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There are completely black corners in some of my photos. What can cause it?

I have a full-frame Canon 5D Mk II and had the problem with my 24-105 Canon lens recently and have experienced it with my 12-24 Sigma lens before.

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2  
Is this with one lens, or every lens? Does the lens have a hood? –  Matt Grum Apr 19 '13 at 13:31
    
I found it with my 24-105 canon Lens recently and had experienced it with my 12-24 Sigma lens before. –  Persian Cat Apr 19 '13 at 13:36
1  
Are you using any type of filter such as a UV filter or circular poloarizing filter? –  dpollitt Apr 19 '13 at 14:07
    
I used UV sometimes but more often the Hama polarized filter for getting better natural colors specially for the sky and the sea! –  Persian Cat Apr 19 '13 at 14:40
1  
The polarising filter sounds like a very likely candidate. I have experenced severe vignetting or black corners on some images because of that. –  Guffa Apr 19 '13 at 15:38

3 Answers 3

up vote 5 down vote accepted

Most likely an incorrectly oriented lens hood. Lens hoods for zoom lenses are petal shaped, with cutouts which are designed to avoid shading the corners. The largest bits of the petal should be top and bottom, if the hood is rotated it could be the corners of the image are being blocked by the hood.

It could be you're using a lens designed for a smaller sensor so the image circle doesn't illuminate a large enough area, leaving dark corners. Finally there could be something lose inside the lens which is causing mechanical vignetting.

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I am going to be worried about my lovely 24-105 canon lens! :( –  Persian Cat Apr 19 '13 at 13:32
2  
That's a FF lens so the image circle is large enough. Can you confirm the hood is correctly mounted? If so then I'm afraid there may be something lose inside the lens... –  Matt Grum Apr 19 '13 at 13:35
    
not all lens hoods are petal shaped, btw. The one for the EF-S 18-55mm Kit lens isn't, for example... –  matt.nguyen Apr 19 '13 at 13:46
    
Can it be fixed if there is a damage in my lens? –  Persian Cat Apr 19 '13 at 14:41
1  
Try taking a shot with the lens hood off to be sure that's not the problem. –  ltn100 Apr 19 '13 at 15:25

There are two factors:

  • Something in the way of the light.

  • A small aperture.

You may have a lens hood that is too narrow for the lens, or a filter rim that is too thick. A polarising filter for example often has a higher ring than other filters.

The small aperture (high f-stop number) makes the lens hood or filter rim come closer to be in focus, so that it causes a black corner instead of just severe vignetting of the corners.

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I can think of a third factor. The subject in the frame could be black :P –  dpollitt Apr 19 '13 at 15:32
    
@dpollitt: That would not be another factor, that would be a completely separate reason. :) –  Guffa Apr 19 '13 at 15:36

I experienced this the other day when shooting video (Canon 5D Mach II w/ 16-35mm), and I believe it was due to the Shutter speed as I accidentally turned the wrong wheel. When I noticed that I went below 1/60th of second to about 1/30th and readjusted the vignetting went away. Truth is I did not notice the vignetting until I played the footage back. Fortunately, I noticed the wheel error before recording a multitude of video clips.

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This theory seems unlikely. How could a faster shutter speed cause this, in either still photography or video? –  mattdm May 27 at 6:14

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