Double-Concave Lenses (Biconcave Lenses)

1.Diameter Tolerance         +0.0, -0.15mm

2.Focal Length                       +/-3%

3.Centration                           <3 arc minutes

4.Clear Aperture                   >90%

5.Surface Figure                    λ/4 632.8nm

6.Surface Quality                  40-20 scratch & dig

7.Design wavelength           632.8 nm

8.AR coatings                         None.