Canon EF 100-400mm f4.5-5.6 L IS USM Lens + 5D = Vignetting?

Has anyone with both a 5D and the 100-400mm lens noticed a severe amount of vignetting when shooting at the 400mm end of the lense? If so, is there a reason for this? I mean I can understand vignetting on my 16-35mm wide angle lense as the lense is actually wider than the full frame sensor... but at 400mm? I shoot RAW so I am able to fix it to some degree in CameraRaw, but its a pain. I've included a sample below (brought down the curves a bit to accentuate the vignetting). Any help in understanding this would be appreciated. Thanks.

MIME changed to 'text/html' | Content warning: script

on my screen the image looks great

I can clearly see it on mine. I don't have an explanation other than I would have thought it would be a problem on the 100-400L

Oh, and you need to clean your sensor. Looks like that 100-400L is pumping some dust in there

Very clear on mine as well. It's easy enough to fix in PS, but yeah... it's there. Dust too.

Here is an example of my Sigma 70-200 2.8 on the 5D.
Resize only , no PP. This one F5.6.
2nd pic with the 400L F5.6. Again no PP.
Easy to fix in phtoshop. If you want full frame , you are gunna get some vignetting.

HOSTED PHOTO
please log in to view hosted photos in full size.

HOSTED PHOTO
please log in to view hosted photos in full size.

Full frame sensors are indeed quite brutal to many a lens..

Even the 24-105 f/4L that was launched at the same time as the 5D, almost a sort of companion lens, has it at 24mm wide open. I rely on PTLens to fix it. Nothing's perfect...

To get rid of the vignetting crop-camera style, just crop in PS - 'digital zoom' or 'EF-S' it yourself

Dave, could I ask you how the Sigma 24-70 fares on full frame when shot wide open at f/2.8? I'm curious.. might think about adding one to my camera if it is up to the job (but that'll be tough now that I've been spoiled by a couple of Ls!) Thank you for the pictures, I found the 70-200 one useful.

StephenJames wrote:
Has anyone with both a 5D and the 100-400mm lens noticed a severe amount of vignetting when shooting at the 400mm end of the lense? If so, is there a reason for this? I mean I can understand vignetting on my 16-35mm wide angle lense as the lense is actually wider than the full frame sensor... but at 400mm? I shoot RAW so I am able to fix it to some degree in CameraRaw, but its a pain. I've included a sample below (brought down the curves a bit to accentuate the vignetting). Any help in understanding this would be appreciated. Thanks.

HTTP response: NOT FOUND | MIME changed to 'text/html' | Content warning: script

There is a small amount of light rolloff towards the corners with this (and many other) lens, which is accentuated when exposure levels are low. Blue skies & other low-contrast, monochromatic subjects are most revealing of this. This shot shows it more than most, but I think it is somewhat underexposed as well and that will make it more visible.

Lightstream wrote:
Full frame sensors are indeed quite brutal to many a lens..

Even the 24-105 f/4L that was launched at the same time as the 5D, almost a sort of companion lens, has it at 24mm wide open. I rely on PTLens to fix it. Nothing's perfect...

To get rid of the vignetting crop-camera style, just crop in PS - 'digital zoom' or 'EF-S' it yourself

Dave, could I ask you how the Sigma 24-70 fares on full frame when shot wide open at f/2.8? I'm curious.. might think about adding one to my camera if it is up to the job (but that'll be tough now that I've been spoiled by a couple of Ls!) Thank you for the pictures, I found the 70-200 one useful.

I'll check the 24-70 and post in a couple of days.

That doesn't look like vignetting to me, Correct me if i'm wrong but that looks like light fall-off.

I've seen a tiny bit of vignetting with the 100-400 at 400 wide open on my 5D, but nothing major.

Lightstream wrote:
Full frame sensors are indeed quite brutal to many a lens..

Even the 24-105 f/4L that was launched at the same time as the 5D, almost a sort of companion lens, has it at 24mm wide open. I rely on PTLens to fix it. Nothing's perfect...

To get rid of the vignetting crop-camera style, just crop in PS - 'digital zoom' or 'EF-S' it yourself

Dave, could I ask you how the Sigma 24-70 fares on full frame when shot wide open at f/2.8? I'm curious.. might think about adding one to my camera if it is up to the job (but that'll be tough now that I've been spoiled by a couple of Ls!) Thank you for the pictures, I found the 70-200 one useful.

Here's a pic with the Sigma 24-70 at 2.8 on the 5D:
(Resized only)

http://img211.imagesha​ck.us …/1236/5dsig2470​f281oe.jpg

Thanks, it looks like there is some fairly serious light falloff in the top two corners. Hmm.. maybe this is not the f/2.8 lens I am looking for...

Im very happy with the 1.6 crop cameras since it really helps hit the lenses "sweet spot"

I dont see any real problems with the above picts tho.

HELLO !!!!!!!!!!!!!!!
Stephen James asked for his 100-400mm and you all answered a crap of? to him, no answers for his questions.
Nice to tell your private stories but no help for this guy.
I can tell you Stephen, that I have no problems with the 100-400mm on my 5D.