Instruct: Classify a given review as either positive or negative.
Query: Sharp Lens

This is a very sharp lens above f2.8. the focus is quick and accurate as well as silent. Great bang for the buck lens and is sharp in the corners unlike some competing brands. At 1.4-1.8 its a little soft but it clears up around 2.0. By f4 its amazingly sharp.Please note that this lens has a Micro USM and is more delicate that other canon lenses. Its best to move the lens to infinity focus while being stored. I haven't had any durability issues but I have read this is a very delicate lens.