A lot of people buy lenses made by Tamron, Tokina and Sigma lenses for Canon. The biggest reason being, third party lenses are almost always cheaper than equivalent lens from Canon. It’s like buying the generic version of a drug, the quality is the same, but you aren’t paying for the name.
If you are considering one of the Sigma lenses for Canon here are some points to consider.
There is quite a bit of money to be saved in the high end zoom lenses. But low end lenses are built cheap to sell cheap. So if you’re considering third party lenses you should consider the higher end of their product line, and avoid the lower end.
On the resell market, Canon lenses tend to hold their value versus third party lenses. And Canon lenses may become a collectible.
Choosing a Canon lens is almost a guarantee that your lens will work with any Canon EOS camera. Always test the lens on your camera first, but there is the possibility that the lens may not work with future EOS cameras.
Some older Sigma lenses are not compatible with the latest EOS cameras. They attach to the camera body but the electronics are different, so the camera locks up and you’ll have to turn the camera off to reset it. Some manufacturers provide a free repairs for the issue. The lenses won’t damage the camera, but it is a hassle to power the camera off and on.
Older Sigma products are infamously known for inconsistent quality. Research online reveals countless complaints from Sigma lens owners. But, newer Sigma lenses seem to be a bit better and have better reviews.
It’s difficult finding useful comparative data for Sigma lenses for Canon. The only way to compare lenses properly is to test them yourself to see if they meet your needs, because most people don’t buy two similar lenses and try them out. Or there are lenses like the Sigma 8mm fisheye which Canon does not make.
Getting back to the compatibility problems, many older Sigma lenses, will not work correctly on some newer EOS camera bodies like the Elan 7/EOS 30/33 and the digital EOS 10D. The most common issue is the mirror flipping up and the camera freezing when you try to take a photo. The only solution to this problem is to get Sigma will upgrade the lens.
The following Sigma lenses require upgrading for compatibility with newer EOS cameras, according to Sigma:
24-70mm 3.5-5.6 aspherical UC
28-80mm 3.5-5.6 mini zoom macro aspherical
28-80mm 3.5-5.6 mini zoom macro aspherical HF
28-80mm 3.5-5.6 mini zoom macro II aspherical
28-105mm 2.8-4 aspherical
28-105mm 3.8-5.6 UC-III aspherical IF
28-135mm 3.8-5.6 aspherical IF macro
28-200mm 3.5-5.6 DL aspherical IF hyperzoom macro
28-300mm 3.5-6.3 DL aspherical IF hyperzoom
70-210mm 4-5.6 UC-II
70-300mm 4-5.6 APO macro super
70-300mm 4-5.6 DL macro super
100-300mm 4.5-6.7 DL
135-400mm 4.5-5.6 APO aspherical RF
170-500mm 5-6.3 APO aspherical RF
8mm 4 EX circular fisheye
15mm 2.8 EX diagonal fisheye
24mm 2.8
28mm 1.8 II aspherical
50mm 2.8 EX macro
105mm 2.8 EX macro
300mm 4 APO tele macro
400mm 5.6 APO tele macro
500mm 4.5 APO
500mm 7.2 APO
800mm 5.6 APO
28-70mm 2.8-4 UC
28-105mm 4-5.6 UC
28-105mm 4-5.6 UC-II
70-210mm 3.5-4.5 APO macro
28-200mm 3.8-5.6 aspherical UC
But in the end, the biggest deciding factor is money. Only you can decide what your priority is and what fits within your budget; low initial purchase price, mechanical reliability, compatibility, user interface or optical quality.
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