(sorry - can't type Chinese) - Can you please try whether DMF (after auto-focus, you can manually adjust the focus and image will be magnified for 2/5/10 sec for you to fine-adjust the focus) still works?
I have a Tamron 18-270mm fitted on my Canon 30D. It works so well (esp. the Tamron's VC in the tele side) and I like it a lot! If the DMF works - I swear I'd pick this one over the SEL18200 very soon :)