ydgmdlu
Veteran
Sigma is one of the three most biggest, most popular third-party manufacturers of lenses for the major camera brands (Canon, Nikon, Pentax, and Sony). The other two are Tamron and Tokina.
Lenses made by these three companies are usually reputed to be of excellent optical quality, often comparable to much more expensive camera-brand lenses of similar specifications. However, they typically have lesser build quality, slower and/or louder autofocus, fewer features (most notably the lack of optical image stabilization), and occasional quality control issues. Personally, I have no problem with using and recommending third-party lenses.
Lenses made by these three companies are usually reputed to be of excellent optical quality, often comparable to much more expensive camera-brand lenses of similar specifications. However, they typically have lesser build quality, slower and/or louder autofocus, fewer features (most notably the lack of optical image stabilization), and occasional quality control issues. Personally, I have no problem with using and recommending third-party lenses.
