18.5″ Diameter, FL -18.0″, Negative Fresnel Lens

Product Details Negative Focal Length Acrylic Substrate Square and Rectangular Options A Fresnel lens replaces the curved surface of a conventional lens with a series of concentric grooves, molded into the surface of a thin, lightweight plastic sheet. The grooves act as individual refracting surfaces, like tiny prisms when viewed in cross section, bending parallel rays in a very close approximation to a common focal length. Because the lens is thin, very little light is lost by absorption. Fresnel lenses are a compromise between efficiency and image quality. High groove density allows higher quality images, while low groove density yields better efficiency (as needed in light gathering applications). In infinite conjugate systems, the grooved side of the lens should face the longer conjugate. Fresnel lenses are most often used in light gathering applications, such as condenser systems or emitter/detector setups. Fresnel lenses can also be used as magnifiers or projection lenses; however, due to the high level of distortion, this is not recommended. Specifications General Type: Fresnel Lens Physical & Mechanical Properties Diameter (mm): 463.55 Diameter (inches): 18.5 Effective Diameter (inches): 18.0 Center Thickness CT (inches): 0.11 Dimensional Tolerance (inches): ±0.05 Thickness Tolerance (%): ±40 Optical Properties Effective Focal Length EFL (mm): -457.20 Effective Focal Length EFL (inches): -18.00 Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Acrylic Coating: Uncoated Wavelength Range (nm): 400 – 1100 Groove Density (grooves/inch): 143.00 Index of Refraction (n d ): 1.49 Transmission (%): 85 (Typical) Environmental & Durability Factors Operating Temperature (°C): ≤80 Regulatory Compliance RoHS 2015: Compliant × Certificate of Conformance: View × Reach 242: Compliant ×