My new Sigma 18-35mm f/1.8

[phaserkb]

Hi.

Yesterday I got a Sigma 18-35mm f/1.8 lens. As every reviewer says, this lens is really sharp and it's kinda extraordinary having a zoom lens so sharp with a constant aperture of 1.8. I'm a little worry about the focus motor noise. I thinks is kinda noisy and I don't really now if this is normal or not. Also when shooting videos the AF tends to hunt a lot in low light. Canon STM lenses performs better on my T4i. Anyone with this lens that have the same issues?

 

[phaserkb]

Hi.

These are some shots that I took with the Sigma 18-35mm f/1.8 and the T4i. The AF accuracy is really bad when using the center point but with the other 8 I get perfect focus every time.