Sunpak made in Japan,  by a major filter manufacturer,   We are very happy to offer the Sunpak DHG series for the value and quality in their products.  The polarizers are very equal to most of the other national brands. The enhancing series of filters are priced, very competitively with the other similar brands. The Sunpak graduals come in large sizes at a good value

Tiffen UVP (Uv-Protectors) are solid glass filters, with no optical coatings. All other Tiffen filters Uv-1's and skylights are laminated (2 pieces of glass, with the laminate carrying the color or effects) and no coatings. For more Tiffen Information

B+W filters are solid Schott Glass, water type, crystal clear. No B+W filter has ever been made with green glass. and they never will, I hope. Quality should always have its standards and the word quality should be more than just a word on a box. Most of all B+W filters have mono coatings on both sides (in some places called double coatings, the double = one on each side)
Please note:  All of the B+W filters 2filter.com sells are mounted in B+W German brass rings only , In markets around the world you can purchase B+W filters in mounting ring materials other than brass. The boxes and the filters look the same in a picture. When you feel the quality of the brass mount you know you have the right one. The B+W MRC coatings are the quality that B+W customers need , the B+W MRC coating is as good as it can be 99.5% transmission.  the MRC coating is on all the Multicoated polarizers we sell.