Instruct: Classify Amazon reviews into positive or negative sentiment
Query: B+W Circular Polarizer

B+W 58mm Circular Polarizer MRC FilterWell made what with the brass ring construction, but it was ineffectual.Test shots were taken both with and without the filter mounted on my Canon G12.The test shots were taken outside, mid-day, of the land, and sky, around my home and included photographs facing East, South & West to test the sky darkening function of the camera - results shown little or no polarizing effect.I also tested the filter, hand held, to test the elimination of reflection from a number of sources such as automobile windows, painted surfaces, etc - same results.Last I tested for color enhancement properties of the filter on the grass, trees and flowers - same results.I have used other mfr's polarizing filters on another camera I own with much better results.Last I'd advise that you test any polarizing filter you may wish to purchase before spending money on something that may not perform to your satisfaction.