Vignetting on the EFS 10-22mm?

[doyqw]

Just want some opinion from fellow users of the 10-22, I just got mine today.

Apparently, the vignetting is pretty obvious wide open and at least has to be stopped to f5.6 before it becomes noticeably acceptable.

Anyone has anything to share? Any comparisons with similar focal length lenses? Sigma 10-20?

[calebk]

Got a photo to show?

[doyqw]

Na....


F/4.5 (20mm wide open)



F/5.6



F/8


The results are similar at 10mm, just wanted to show these to illustrate another problem: my simple series of tests also shows that the sharpness at f5.6 always seem to be worse off than wide open and at f8....

Sian... Dunno what's wrong...

[bernstein1234]

If you compare your f4.5 and f5.6 shots, the f4.5 is SHARPER (see the 8 and 15 at the Sat column)... I think your f5.6 shots are not focused correctly. You used tripod right? Go and take another test and see. The f/5.6 looks unfocused to me.

2 cents

[doyqw]

Originally Posted by bernstein1234 If you compare your f4.5 and f5.6 shots, the f4.5 is SHARPER (see the 8 and 15 at the Sat column)... I think your f5.6 shots are not focused correctly. You used tripod right? Go and take another test and see. The f/5.6 looks unfocused to me. 2 cents

I get what you mean - but the same off-focused results appeared several times in my series of tests on f5.6. Makes me wonder if it was really my fault....

[calebk]

I doubt a lens would misfocus only on a certain aperture value.

WRT the vignetting, I wouldn't say this is very blatantly obvious, but it is mildly expected from a lens this wide. Even my Sigma 10-20 has some light fall-off wide open at all focal lengths, with just a normal thickness Hoya HMC filter.

[bernstein1234]

Originally Posted by doyqw I get what you mean - but the same off-focused results appeared several times in my series of tests on f5.6. Makes me wonder if it was really my fault....

Hmm I get what you mean... If I were you I wouldn't have noticed, last time I used 10-22 to take scenery instead of numbers, so I don't know if this is the nature of most 10-22mm, or izzit yours is a lemon. But nevertheless, you can bring this issue to Canon, and ask them to service for you. See how and tell us the result.

[Russ]

Perfectly normal.

http://www.photozone.de has a lot of lens tests and they actually measure vignetting in number of stops and all lenses will have light falloff at the corners - some are more noticeable than others. Go and have a look. The tests show that the Sigma is worse and only gets to about half a stop at F/8, whereas the Canon gets there by F/5.6

[varf]

taking your filter off will help alleviate the vignetting somewhat.

[doyqw]

Originally Posted by bernstein1234 Hmm I get what you mean... If I were you I wouldn't have noticed, last time I used 10-22 to take scenery instead of numbers, so I don't know if this is the nature of most 10-22mm, or izzit yours is a lemon. But nevertheless, you can bring this issue to Canon, and ask them to service for you. See how and tell us the result.

Hehe... Nvm.. I admit I'm being slightly paranoid... Anyway, it's a 2nd hand set. So no warranty...

Originally Posted by varf taking your filter off will help alleviate the vignetting somewhat.

Yep... I tried that in my tests - for once, I noticed differences on a lens with and without a filter. It didn't really make a difference on the vignetting, but the picture looked slightly darker with the exact same shoot settings.

[bernstein1234]

Originally Posted by doyqw Hehe... Nvm.. I admit I'm being slightly paranoid... Anyway, it's a 2nd hand set. So no warranty...

Haha it's normal to be 'slightly paranoid'... I'm also liddat.. Who wouldn't after they have bought a near 1K equipment?

[patomilan]

Originally Posted by bernstein1234 Hmm I get what you mean... If I were you I wouldn't have noticed, last time I used 10-22 to take scenery instead of numbers, so I don't know if this is the nature of most 10-22mm, or izzit yours is a lemon. But nevertheless, you can bring this issue to Canon, and ask them to service for you. See how and tell us the result.

I think maybe the copy of TS got problem at f 5.6 my copy sharp at 20mm 4.5 and can see clearly the sharpness improvement at f 5.6

[mervinb]

Originally Posted by doyqw Just want some opinion from fellow users of the 10-22, I just got mine today. Apparently, the vignetting is pretty obvious wide open and at least has to be stopped to f5.6 before it becomes noticeably acceptable. Anyone has anything to share? Any comparisons with similar focal length lenses? Sigma 10-20?

You should try to shoot a series at different aperture setting, using RAW, and processing via DPP with and without vignette correction. Putting the original and corrected images will give you a real good sense of the extent of vignetting. My assumption is that Canon is pretty accurate in their s/w correction. My feeling is that it's not a major problem.

BTW, most of the technical issues with this lens, like many other wide/ultra wide zooms, are CA and geometric (barrel) distortion. This is where DPP and PTLens are great. I did an A3 photo for a folder (amateur level!), and the distortion and CA correction made the image look technically really clean.

[bernstein1234]

Originally Posted by patomilan I think maybe the copy of TS got problem at f 5.6 my copy sharp at 20mm 4.5 and can see clearly the sharpness improvement at f 5.6

Ya, that's what I think - USUALLY after stopping up the sharpness should increase instead of showing the problem TS encountered.

[doyqw]

Originally Posted by mervinb You should try to shoot a series at different aperture setting, using RAW, and processing via DPP with and without vignette correction. Putting the original and corrected images will give you a real good sense of the extent of vignetting. My assumption is that Canon is pretty accurate in their s/w correction. My feeling is that it's not a major problem. BTW, most of the technical issues with this lens, like many other wide/ultra wide zooms, are CA and geometric (barrel) distortion. This is where DPP and PTLens are great. I did an A3 photo for a folder (amateur level!), and the distortion and CA correction made the image look technically really clean.

Thanks! I'll often shoot raw but hardly played with those distortion or CA correction features... Will try them out!