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 Agung Budiyanto ᠌

Bought for another 24t. R which he certainly does not deserve, its price is 12-14. Now, of course, I would take Sigma 30mm 1.4. In general, the glass is not bad but no more. The 2.8 hole is quite working at 17-25mm, but at 50mm the focus very often goes to infinity and very important shots are lost at the wedding. There is a front focus and it depends on the focal length. Misses of 20 percent. The colors are not bad, but in difficult lighting conditions, the BB is frankly lying, maybe it's 550's fault, but this was not the case on canon 18-135. I have no complaints about the quality of workmanship - in the rain, snow, from -30 immediately to heat and everything is OK. For some, the stabilizer raises questions, and when focusing, something clicks in it, if you shake the lens, it rattles inside as if it had fallen off, but it does its job. A good replacement for a whale, aperture ratio, convenient focal lengths, writes excellent video at 2.8