Fused Silica Material 60mm Aspheric lens 

BK7/Fused Silica Material 60mm Aspheric lens An aspheric lens or asphere is a lens whose surface profiles are not portions of a sphere or cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens.    Aspheric elements are used in the design of multi-element wide-angle and fast normal lenses to reduce aberrations.  While in principle aspheric surfaces can take a wide variety of forms, aspheric lenses are often designed with surfaces of the form   Technical Specifications: Material BK7,JGS1 JGS2 HK51 B270 Dimension  10mm 12mm 15mm 18mm 20mm Dimension Tolerance +/-0.15mm,  +/-0.2mm,  +0/-0.1mm as request Centration <3'…