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About product and suppliers:
        Alibaba.com offers 177 50mm fresnel lens products. About 79% of these are lenses, 1% are magnifiers, and 1% are alarm. 

A wide variety of 50mm fresnel lens options are available to you, such as plano, aspheric. You can also choose from plastic, glass. As well as from free samples, paid samples. 

There are 177 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 North America, South America, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 5 with Other, 4 with ISO9001, and 1 with ISO14001 certification.