I bought this set of filters for my pentax k-x 18-50 mm lens. I think it works great. The CPL filter works great. I was able to compare it a CPL filter in a cheaper set and this one performed better in terms of filtering efficiency. I learned that a good way to evaluate filtering efficiency was to view an LCD monitor through the filter. I did so with the CPL filter in this kit and managed to completely block out the image on the monitor, whereas the CPL filter in the cheaper kit darkened the image and turned it purple but didn't blot out the image completely. The build quality is nice, looks like an aluminum ring with a glass component. Image quality doesn't seem to be adversely affected when using the filter.
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