Camera Labs

Hey,

My Tamron 10-24mm lens is having real trouble focusing in LiveView, but not so bad in Viewfinder. I hold the shutter half way down to focus and it sometimes focuses and sometimes doesn't. If it does focus it's not in focus. I've sent this back to Jessops where I brought the lens and they "Repaired it" although it's still having this problem. If you look at the video posted below it shows you what I mean, But the last clip is the interesting one, I have to keep pressing the shutter to focus it but it gets more and more out of focus?

Any ideas? Should I can my money back?

Video:
http://www.youtube.com/watch?v=y-bVGtCvDv4&feature=youtu.be

Thanks

Ben