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About product and suppliers:
        Alibaba.com offers 182 50mm fresnel lens products. About 84% of these are lenses, 1% are magnifiers. 

A wide variety of 50mm fresnel lens options are available to you, such as aspheric, plano, and spherical. You can also choose from optical, infrared. As well as from plastic, glass. And whether 50mm fresnel lens is double convex, plano-convex, or plano-concave. 

There are 182 50mm fresnel lens suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of 50mm fresnel lens respectively. 

0mm fresnel lens products are most popular in Western Europe, South America, and North America. 

You can ensure product safety by selecting from certified suppliers, including 18 with ISO9001, 5 with Other, and 1 with ISO14001 certification.