Instruct: Classify a review into positive or negative sentiment.
Query: Very poor quality lens

I have a bit of experience with fresnel lenses from working with them in flight simulators. This lens is of very poor quality, and to make it even worse it's curved in its frame making focus at the edges off from the center. Also the blue tinting is annoying. I've always used clear Fresnels from Edmund Scientific for monitors up to 22" and they blow this one away at less money. I do not agree with the other reviews, and if I could give it zero stars I would. Money down the toilet for me :(