Sigma lenses and their problem - share your experience

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CESA Regular Member • Posts: 327
Sigma lenses and their problem - share your experience
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Hi all,

I was thinking about buying a sigma 135mm f/1.8 but I have heard a lot of bad things about the brand sigma.

What I would like to know is (based on what I read and watched):

1. Why do sigma lenses have this problem focusing? Why this happens? People complain that lot of images get out of focus.

2. If we use a sigma lens that is inconsistent with the focusing on a DSLR, has anyone used it on a mirrorless camera and it worked well?

3. Have heard that because mirrorless camera don't have this AF module, sigma lenses and third party lenses in general don't have this problem anymore.

Is this true? Why?

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