Strange shadow in corners of photos

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SuperCNJ

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Just wondering what is causing this, it doesn't do it all the time but normally when I shoot wide angle shots of blue skies I get a strange blue shadow in the top corners.

I am wondering whether it is caused by the hood or perhaps the UV filter I have permanently on my lens. Camera is D40X, lens is Nikon 18-200VR.



Any ideas? :shrug:
 
vignetting probably caused by the hood, i have the same problem with my Fuji S6500fd
 
I got it last year on hol's, using a 5D, 28-200 USM, + Hoya circular pol filter, going to do some takes and check!
You can take it out with Adobe but it would be better to know why.
Jim
 
jimybell said:
I got it last year on hol's, using a 5D, 28-200 USM, + Hoya circular pol filter, going to do some takes and check!
You can take it out with Adobe but it would be better to know why.
Jim
Click to expand...

Yep, I "think" (can't remember exactly) that I used a hoya polarising filter for this shot as well. I have a tendancy to use CP filters for blue sky/cloud shots. Do you think this is whats causing it?

Or could it be the hood? It doesn't do it on all my shots and usually only spot the problem once I've downloaded the photos onto my PC.
 
Got to be an attachement, I get the same thing with some lenses.
 
If your using a circular polarising filter and you are at a certain angle to the sun and havnt adjusted the filter correctly you will get a gradiented of different shades of blue and if severe enough could make these dark blue shadows.

Try and make sure the scene is equal in your viewfinder first.
 
It could be any of 3 things.

Some lenses just vignette, especially wide angles when the aperture is wide open. The 18-200 does exhibit this sometimes.
The hood could be poorly designed, but I doubt this, especially on a decent lens.
The filter could be quite thick and you're actually capturing the rim of the filter in the image.

It's probably a combination of all 3. Seeing as you took that photo at f/5. see if it goes away at f/8. You should also try removing the filter.

Using a circular polarising filter on a wide angle shot of the sky will give you odd results, with half the sky brighter than the other half. This is because the polarisation of the light actually changes throughout the sky.
 
At 18mm, even one filter could cause that vignette so 2 stacked filters almost certainly would cause it. It often goes un-noticed through the viewfinder since few "consumer" grade cameras these days have 100% viewfinder coverage. I very much doubt that the hood would cause the problem - it could be that you notice it on shots where the hood is fitted because you might only fit the hood in bright lighting which would probably invite smaller apertures which would show up any vignette more...
 
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