Instruct: Classify a given review as either positive or negative.
Query: Lens cap does not fit polarizer

Canon makes several excellent lenses that use 77 mm filters. One would think that Canon would ensure that the 77 mm lens cap would fit over the polarizer filter. Surprise, it does not!! This is a serious defect with this expensive filter. Without being able to protect the filter with a lens cap, my filter has gotten seriously scratched. The filter itself is of high quality.