Specification:

Material: Crown Glass and Flint Glass

Diameter:54mm

Diameter Tolerance: +0.0, -0.05

Focal Length: 230mm

Center Thickness Tolerance: ±0.1

Surface Quality: 40-20 scratch and dig

Centration: ±1 arc minutes

Surface Figure: lambda/4 @ 632.8nm

Clear Aperture: >90% of diameter

Bevel: protective chamfer

Coating: upon requirement

Realpoo Optics is a professional manufacturer of optics. Optics includes spherical lens, aspherical lens, glass tube and flat lens. Spherical lens such as cylindrical lens, convex lens etc. Flat lens includes optical window and mirror. both achromatic lens and cylindrical lens can be offered with AR coating or without coating.