Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Err99s

I bought this lens to use with my Xti. Less than a week after I bough it I started to get the err99 message. Now I get it every time i use it. I am going to take a few more pictures with it and if I don't like the way they turn out I will return the lens. After taking a few pictures with this lens I have noticed that the CA is horrible. The sharpness drops off after 200mm. You get what you pay for.EDITI have returned the lens to amazon