| http://www.w3.org/ns/prov#value | - Examples of the luminosity factor-compensating filter made of plastic include optical filters (Japanese Patent Application Laid-Open No. 118228/1994) comprising a copolymer obtained by polymerizing a monomer mixture of a phosphate group-containing acrylic monomer and a monomer or monomers copolymerizable with this acrylic monomer, and a metal salt composed mainly of a copper salt, and the like.
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