Vignetting/light falloff on my 70-200 DG Macro

[adam LC]

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:eek:

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

http://farm2.static.flickr.com/1270/544238368_bb9d2d87a4_o.jpg

http://farm2.static.flickr.com/1373/544238502_ab54ec2443_o.jpg

http://farm2.static.flickr.com/1181/544339729_485b9e0b93_o.jpg

http://farm2.static.flickr.com/1295/544339553_aa50106a15_o.jpg

http://farm2.static.flickr.com/1376/544339487_bd3666e339_o.jpg

http://farm2.static.flickr.com/1023/544238412_acabc6339f_o.jpg

[In2Photos]

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

[adam LC]

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)
http://farm2.static.flickr.com/1265/544281812_0d70b288d2_o.jpg

[In2Photos]

Any filters on the lens?

[adam LC]

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

[In2Photos]

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.

[JWright]

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...

[adam LC]

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.

[asylumxl]

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

[adam LC]

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?

[ed rader]

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

[adam LC]

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.

[ed rader]

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 :D !

ed rader

[Tee Why]

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.

[adam LC]

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.:(

[JWright]

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

EF lenses were developed for Canon's original EOS film cameras. Since these have exactly the same frame size as the 5D, you shouldn't have any problems with them. You might have some edge fall off with extreme wide angles on the 5D, but it should be minimal. Be very careful when using filters on wide angle lenses on the 5D. The camera may "see" the edges of the filter and cause vignetting.

Most of the third party manufacturers have released lenses optimized for the 1.6X crop cameras. These lenses can be mounted on any EOS mount camera, hence the disclaimers that "digitally optimized" lenses will not work on full frame cameras. The following quote is from the Tamron website and is about their 11-18mm Di II lens...
"Di II: Lenses are designed for exclusive use on digital cameras with smaller-size imagers and inherit all of the benefits of our Di products. These lenses are not designed for conventional cameras and digital cameras with image sensors larger than 24mm x 16mm."

Canon resolved this issue by creating the EF-S line of lenses designed for the 1.6X cameras. Because of the slightly different mount, these lenses won't mount on other EOS cameras.