Brand New Shen Hao 4x5 Camera Fresnel Lens Start Price USD 62.00 Current Price USD 62.00 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Tuesday, December 02, 2008 End Time Friday, December 26, 2008 Location Solon, OH See more about 'Brand New Shen Hao 4x5 Camera Fresnel Lens ' Description You are bidding on Brand New Shen Hao 4x5 Camera Fresnel Lens. This modern Fresnel screen is brightest and cleanest. The item increase the brightness of the image in ground glass significantly, which makes focusing mch more acurate and easier. The item is in factory sealed bag. The quality is unconditionally guaranteed. Buyer pays fixed $10 S&I in USA. ABOUT FRESNEL LENS: 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. Place a Bid!