Sigma 17-50mm is good or not?

Tony-S wrote in post #13937967
From infinity to minimum (and back) the Canon is a bit faster. The advantage of ring-USM vs. micro-HSM. Also, the Canon has full-time manual focus whilst the Sigma does not.

what do u mean by it doesn't have full-time manual
Focus

When the lens is set to autofocus you cannot override its focus lock by turning the focus ring. With the Canon you can. It's nice but not something I use very often.

@tony s OK thanks that don't really matter to me that's nothing

The Sigma 17-50 OS HSM is an absolutely stunning lens. I bought it about 7 months ago and it has been glued to my camera ever since. I can't recommend it enough.

As others have stated, this lens is a real gem. I had very high expectations of this lens after the purchase of the Sigma 70-200 OS; not once have I found myself saying I sure wish I had spent another $400 for the Canon.