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We are interested in positive linear point fresnel lenses larger than 500mmx500mm for our concentrated photo-voltaic systems and would like to know whether your company has any products in that field.we would appreciate it if you could send us product catalogs and specs that include:1.lens dimensions, width, focal length and pitch ***** and uv and weather resistance details. 3.prices and supply times. Thank you very much, looking forward to your reply, ron. fresnel lenses fresnel