Review on Sigma 17-50mm f/2.8 EX DC OS HSM FLD Lens: Large Aperture Standard Zoom for Canon DSLR - International Version (No Warranty) by Bogdan Andreev ᠌

The best value for money. If you do not pay attention to minor flaws, then the lens is a worthy choice for many tasks: from landscapes to portraits. Some pros: HSM - very tenacious and fast, good color reproduction, lens hood + good case included (unlike greedy kenon), stub helps out, good for traveling. Its cons: It is impossible to bring the focus, it turns yellow (it can be solved by setting the BB), the stub is noisy.