What's causing my dark corners?

M

MarlowTrips

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Name
Jide SObo
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I took this shot the other day but I don't know why the corners are dark, especially in the top left? Any ideas? It was taken on my 400D with a Sigma 18 - 200 lens at 18mm, f3.5 and 1/250. ISO was 100.

Thanks in advance.

Lens_problem.jpg
 
.. or a lens hood

but more than likely its just a facet of the lens when it's wide at 18mm
 
Thanks for the quick replies! Yes, I was using a circular polariser, will that make the effect worse?

How can I avoid this in the future? Will a different aperture make a difference?
 
Basically, yes any filter, CP especially, will make things worse.

What you are doing with an incorrect hood or filters is adding a tube to the front of the lens. With a long
enough tube you'll get a circular image

Usually you can get away with 1 filter, but CP's tend to be quite thick. In your case it looks like you see
the effect.
 
Stopping down a bit say 2 stops will reduce the vignetting. Also it is fine to use a CP but don't stack it on top of your UV filter which I assume you have fitted to protect the front of your lens.

There's no advantage in using such a wide aperture in this shot anyway.
 
Theres quite a lot of programs that allow to you apply or remove vignetting. I use lightroom and it can probably solve that. Some photos I love adding it too though
 
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