Great equipment. Everything Iv'e used from Zeikos has been excellent quality including these filters.
Stiff frames with close tolerances for glass fitment make this trio of filters feel like the higher grades of the higher priced filters from the familiar brands. Upon delivery, I immediately installed the UV filter in front of the Zeiss lens on my camera. Afraid that the glass filter would distort and blur the excellent original optics, I was actually disappointed that those effects could not be discerned (to justify my writing an annoyed and annoying review so often seen on this website). Oh, well. This review is incomplete--I don't use polarizing filters or whatever the third one in the set is so they're still in their original cellophane envelopes in their own separate compartments in the gently padded filter case provided. Such a good value compared to the brand-name skylight filter I had bought for my first brand-name DSLR years ago. Though I don't like the darkened tones created by polarization, I think I might try out the polarizing filter and maybe even try to figure out if that third, unused filter (whatever it is) might be of any use.