I've had my Sigma 24-70 for around 10 months now and today I noticed the lens wasn't focusing right. I'd push the focus button and the lens would make a noise like it focused, the camera would make the lock sound and the red box would light up but the image was noticably out of focus. I found that if I moved the front end a bit it would go in and out of focus. This was all on automatic. I'm talking about the part that comes out as you zoom. Surely it shouldn't be doing that? I'm guessing I'll have to return it to Sigma but I was really looking forward to using it at the Chinese New Year in Liverpool in the next 2 weeks. I doubt Sigma will be that quick to fix it?