Noooooooo! My Canon L lens can't be vignetting, can it?

Question

Taking photos this morning in the fog, and when I downloaded them to the computer they were four dark corners on many of the photos. Camera: Canon 5D Lens: Canon 70-200 "L"

This can't be happening can it? This lens has been a dream for me.

Please help. And thank you.

OMG, I ♥ PONIES!!1 · Accepted Answer

Both the f/2.8 and the f/4 versions do vignette slightly on a full-frame sensor, but only at large apertures. (The f/4 a bit more than the f/2.8.)

It's a heck of a good lens but it ain't perfect. 

And like I said, only at large apertures. If you were shooting at f/8 or so, that can't be the cause. Other possible problems: if the scalloped lens hood was attached incorrectly, or if you were stacking filters.
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just checking back...

I sincerely doubt that your 5D or 70-200 is a knock-off. The problem with vignetting is very slight but real - you can verify this with a 5 minute Google investigation.

You can check the extent to which your lens vignettes and determine if the filter makes things worse by taking some test shots (of a clear blue sky or a white wall for example, with and with out the filter, at various aperture settings, and at various zoom setting.)

aperture64 · Answer

Could be the fog. You shouldn't have vignetting, unless the lens hood is on wrong or you have too many filters stacked.

Alejandro E · Answer

did you have a filter on it? if you have a "thicker" filter, or have stacked filters, that could be the cause of the vignetting. I have a 70-200 IS USM and have had no issues.

Polyhistor · Answer

Canon would not make a product that would do that.  That is professional line

Noooooooo! My Canon L lens can't be vignetting, can it?

4 Answers