You are bidding on Brand New Modern Fresnel lens with ground glass for Tachihara 8x10 camera made of modern high intensity, anti-scratch optical plexiglass. This advanced ground glass was optically coated in high-tech, is much better than the traditional acid glass. The ground glass works with the finest Fresnel lens to show the brightest and sharpest image to make the focusing much more easier and accurate. 

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The Fresnel lens was invented by French physicist Augustine Fresnel, the Augustin Fresnel first used this lens design to build a glass Fresnel lens - lighthouse lens in 1822.
The Fresnel lens is a thin, flat optical lens which consists of a series of small narrow concentric grooves on the surface of a lightweight plastic sheet in order to reduce the thickness, weight and cost. Each groove is at a slightly different angle than the next and with the same focal length in order to focus the light toward a central focal point. Every groove can be considered as an individual small lens to bend parallel Fresnel light waves and focus the light. The lens actually eliminates some spherical aberration.