Concave lens that possesses at least one surface that curves inwards.
 It is a diverging lens, spreading out those light rays that have been
 refracted through it. A concave lens is thinner at its centre than at
 its edges, and is used to correct short-sightedness.
 
 Material:Fused cilica, BK7 Grade A or equivalent optical glasses
 Design Wavalength:546.1nm
 Diameter Tolerance:±0.1mm, ±0.15mm for Dia.≥75mm
 Paraxial Focus Length:±2%
 Centration:<3 arc minutes
 Clear Aperture:>85%
 Surface Figure:λ/4 at 632.8nm
 Surface Quality:20/10 or better
 Coatings:Antireflection coatings or NIR coatings or no
 Bevel:protective bevel

 We could offer concave or convex lenses according to custom design.
 Besides, there are a large volume of stock optical components in various
 shapes and sizes to facilitate quick deliveries.