Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Quantaray Filters are Functional

Quantaray is the low priced spread. Mechanicaly these lens filters work. I mean they are threaded correctly. The UV and Circular Polarizer I bought both had one or two little tiny air bubbles in the glass. For most imaging you wont see these "artifacts" but for pros and certain phtographic applications you will at least be removing the problems with photo shop.To get no bubbles you will have to spend at least twice as much or buy Quantaray in a store and inspect them with a magnifying glass.Just for having that sacrificial UV lens filter stuck on to your expensive optically stabilized lens while you drag your DSL around Quantaray works fine. Spend more on a circular polarizer. But you should know how to use it.