problem at 18mm ?

[Yardbent]

taking some outdoors the other day - noticed this when downloaded
taken at 18mm 18-55 DX GII on my D40
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bad corners ? - cannot be certain there wasn't a C/PL filter - so did some tests this evening..against a flat wall - no filter or hood - just glass
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surely not right ??........:shake:

 

[leaky5]

Looks like vignetting to me.

http://toothwalker.org/optics/vignetting.html

 

[Yardbent]

Looks like vignetting to me.
http://toothwalker.org/optics/vignetting.html

Yes - interesting article - skimmed but will read deeply
""Optical vignetting tends to be stronger in wide-angle lenses and large aperture lenses, but the effect can be noticed with most photographic lenses. Zoom lenses are often saddled with a fair amount of optical vignetting""

the tree in the OP was exposed at 1/200 @f6.3 -- hardly wide open ?

and I have never noticed it before in landscape shots
here's one at 18mm but cannot remember if its cropped .....
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surely I would have noticed it before - bought the lens in November

cheers