Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Utter JUNK unsupported by Canon

Bought 20 examples of this lens for a course I teach in Photography. Had problems from the first 6 months onward. 20/20 lenses either repeated Error 99 issues unresolved by cleaning contacts, dropped aperture blades, or constant hunting around for a focus point even in brightly lit scenes. .Contacted Canon and received no support other than to tell me that they are great lenses that they've had no problems with.... try a search for "Canon 17-85mm problems" the internet is littered with examples of the poor quality and NO support. Lens has been discontinued due to such poor construction.Shame on Canon for putting a 600 price tag on a faulty piece of equipment. I will not be buying another thing from them again based on the complete lack of customer service my school, my students and I received. As a photographer who loved the durability of my first Canon camera and lenses, this is greed at it's worst.