Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not up to specs

I was very disappointed with this lens. It has a very cheap feel and the image quality was terrible. I was only able to test it with my Canon 20d and not with film. I couldn't believe how lousy it was, I had read some other reviews and they seemed positive. I tried it on a tripod and shot a variety of things text and 3-D objects and never could pull a sharp photo. I noticed that I had to use a lot more unsharp mask than normal to be useable. I tend to use primes a lot and so maybe I expected to much.