Drum Lenses - Drum lenses are ball lenses which have been ground down to provide a cylindrical mounting surface for ease of handling and mounting. JML offers drum lenses in three different glass types: BK7, LaSFN9 and SF8.
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Fresnel lenses - Unlike traditional lenses, Fresnel lenses do not employ smooth-surface contours to focus rays of light. Instead, the surface of a Fresnel lens is molded into many circular, concentric ridges. These circular ridges give the Fresnel lens a zigzag or sawtooth cross section. Each Sawtooth creates a tiny prism. By choosing appropriate powers for these prisms, designers can define the focal length and control image quality. JML offers injection molded, acrylic Fresnel lenses.
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