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Hi all,
When shooting inside or outside and all conditions with this lens, I'm getting a circle...sometimes dark sometimes light...in all four corners...has anyone had similar problems with this/other lenses? Should I bother Sigma with this? The lens IS still under waranty. I've heard of vignetting, but this isn't like a super wide angle lens type of dark corners...
Ryan
Discussion is locked
I stick with Canon lenses. I'm pretty sure there won't be any problem.
I wish you have posted a link so that we could see a sample photo.
I found a discussion about the Sigma 18-125 and vignetting.
It is quite interesting.
The sample photo in the thread is no longer available but the text tells the story.
http://forums.dpreview.com/forums/read.asp?forum=1029&message=10522534
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that kind of problem may exist. Keep in mind that kind of lenses probably were designed for the full-size sensor ( film like ). Consequently, some distortions can be seen when shooting upon FOV ( 1.6 multiple factor ) camera. Here are some explanation.
http://web.canon.jp/Imaging/cmos/technology-e/size.html
I'm not sure how well Sigma and Tamron Lenses ( older version ) were designed for DSLR. The newer version, designed for the DSLR, seems to work better than the older version. Nevertheless, I'd better buy the same camera and lense brand for the undesired effects of shooting.
If you can still return it, do it. It might cost alot more but in my experience, It is worth it to get the canon lens. Too bad.
I have the same camera and lens combination and haven't experienced the above problem, so I would suspect you have a problem with the lens.
I was wondering; Have you tried the lens with another camera such as the Canon D60 or D10 to see if they have the same problem.
I did notice that my Canon 20D has problems with the autofocus when using this lens; Sometimes it works and sometimes it don't, and according to Canon, this is due to the new way the autofocusing circuits work with the Canon 20D.
The Canon Representative told me that because Sigma is supplying 3rd party lenses and has to reverse engineer existing Canon systems, they are more prone to error.
As a result of this, I mainly use my Sigma lens in manual focus, and the results are outstanding.
Incidently, I also use this lens with my older Canon D60 and have had no problems at all with that combination.
Good Luck with resolving your vignetting problem!
Best Regards,
Larry
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