Vignetting/light falloff on my 70-200 DG Macro

I was really pleased when I got this lens, but after a bit of shooting I noticed pretty bad vignetting/light falloff. So these are my test shots. Manufacturers lens hood in correct position, Mirror lockup, self timer, av mode... yes I messed up the wb. Resized just for this. Opinions please as Sigma technical support seem to think they are fine

No.1 - 107mm f/2.8 1/160 100
No.2 - 148mm f/3.2 1/125 100
No.3 - 200mm f/2.8 1/125 100
No.4 - 200mm f/11 1/8 100
No.5 - 70mm f/2.8 1/160 100
No.6 - 107mm f/5.6 1/40 100

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What are you using to illuminate the model and/or background?

My home made light box, surrounded by tracing paper and lit from above with a 500w lamp.

This image was taken yesterday of the sky, 200mm f2.8 1/640 iso 800 (i think)

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Any filters on the lens?

Nope, the shots of the manikin were with just the hood and the shot of the sky is with nothing!

adamlc wrote in post #3371406
My home made light box, surrounded by tracing paper and lit from above with a 500w lamp.

This image was taken yesterday of the sky, 200mm f2.8 1/640 iso 800 (i think)

These settings seem off. What time did you shoot the sky? That falloff seems to be too much.

Quote from Sigma's website regarding DG Lenses:

"These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs."

I think what is happening is you are seeing some vignetting from the wider frame of the 5D. Although Sigma says DG Lenses are suitable for "traditional 35mm SLRs," it is likely the larger frame of the 5D is the source of the edge fall-off. I thiink they missed the boat by trying to make a lens suitable for both crop and full-frame cameras...

In2Photos wrote in post #3371475
These settings seem off. What time did you shoot the sky? That falloff seems to be too much.

I shot the sky at 20:18, it starts getting dark at 21:30. 1/640s, f/2.8, evaluative metering, 800iso, 200mm, (WB Tungsten) I know!.

According to EXIF.

personally, i like the vignette but yeh, i figure its just not very good for fullframe.

JWright wrote in post #3371482
Quote from Sigma's website regarding DG Lenses:

"These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs."

I think what is happening is you are seeing some vignetting from the wider frame of the 5D. Although Sigma says DG Lenses are suitable for "traditional 35mm SLRs," it is likely the larger frame of the 5D is the source of the edge fall-off. I thiink they missed the boat by trying to make a lens suitable for both crop and full-frame cameras...

This is what I was affraid of. Is it the same with the EF on the 5D?

adamlc wrote in post #3371662
This is what I was affraid of. Is it the same with the EF on the 5D?

i get slight vignetting @ f4 with my 70-200L f4 IS but not that bad.

ed rader

ed rader wrote in post #3371763
i get slight vignetting @ f4 with my 70-200L f4 IS but not that bad.

ed rader

That's just it, if I had "slight vignetting", I wouldn't mind, but this to me seems too much.

adamlc wrote in post #3371831
That's just it, if I had "slight vignetting", I wouldn't mind, but this to me seems too much.

i hear you. you know how to fix the problem !

ed rader

I think you'll see that with many lenses, especially fast ones wide open with the full frame sensor.
DPreview has a nice section about it on their 5D test.

My lenses all at f/2.8
24-70L = extremely slight
100mm macro = fine
15mm FE = very slight

Maybe I was hoping too much for the cheaper choice.