You are bidding on Brand New  Graflex R B Super D 3x4 camera Fresnel lens with ground glass. This Fresnel screen with ground glass is brightest and powerful, which significantly increase the brightness of the image on the ground glass to make focusing much more easier and accurate.     This is the finest Fresnel screen. This Fresnel lens can be also used with other Graflex 3x4 RB Series cameras  as well as RB Auto 3x4 cameras. 

The condition is unconditionally guaranteed.  The fixed shipping and insurance in US is  $9. 

 About modern Optical Acrylic Ground Glass:     Nowadays all of eyeglasses are made of the plastic acrylic. In the currently market, one definitely cannot find a modern eyeglasses which are made of traditional acid glass. Why? Because the modern optical acrylic is much more lighter, brighter, stronger and durable that the traditional acid one. The new type ground glass made of optical anti-scratch acrylic is much more brighter and stronger that the original acid ground glass. 

We are professional provider of the large format items including ground glass and fresnel lens . Please see visit our website for more details. 


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.