Optical lens
Plano-convex, plano-concave, double convex, double concave, meniscus, achromats etc.
Shaps: Spherical, aspheric, ball, plano, cylindrical etc.

Specifications:
Material: Bk7, Quartz, Caf2, Sapphire.
Diameter: . OD: 2mm-120mm
Edge thickness: 1mm +/- 0.10mm.
Focal length: 0.1% to 2%.
Surface quantity: 80/50 to 20/10.
Centration: 1 to 3Arc minutes
Fringes: 1 to 5
Coating: No or AR.
Clear Aperture>90% of diameter