Product Name: Biconcave Optical Lens Model NO.: biconcave lens Coating: Clear Customized: Customized Certification: RoHS, ISO9001, CE Lenses Color: Clear Material: Glass Shape: Biconcave Transmittance: 90%-95% Type: Concave Lens Usage: Lighting, Medical, Optical Trademark: Haisheng Transport Package: Carton Package Specification: customized Origin: China HS Code: 9001909090 Product Description biconcave optical lensProduct description:double concave glass lensDouble concave lens is the most common form of Negative lens. Negative lens is most suited to producing diverging light or a virtual image, where the input light is converging.Specifications:Material:BK7, Fused Silica, SF10, CaF2, Sapphire .etc.Paraxial Focal Length Tolerance:±2%Dimension Tolerance:±0.2(General). ±0.05(High Precision)Centration:<3 arc minIRR:λ/4@633nm(General),λ/10@633nm(High Precision)Clear Aperture:>80%(Small Size), >95%(Large Size)Surface Figure<1.5λ@633nm(General),<λ/4@633nm(High Precision)Surface Quality:60/40(General),10/5(High Precision)Bevel:<0.25mmCoating:Uncoated, AR,PR, HR, etc.Production:Package:Delivery: