Specification :

plano concave lens

Material: flint glasses, UV-fused silica, Infrared fused silica, CaF2, Ge, ZnSe, Si, etc.
Focal length: ¡À5mm --¡À1000mm¡À1%
(test by TIROPTICS OPTOMATIC2000 made in Germany)
Diameter: 4mm--200mm ¡À0.1mm
Tc torlerance:¡À0.1mm
Centration: 3-5'
Surface accuracy: ¦Ë/2
Surface quality: 40/20
Clear aperture: 90%
Coating: custom design