Material: flint glasses, UV-fused silica, Infrared fused silica, CaF2, Ge, ZnSe, Si, etc. Focal length:+/-5mm-- +/-1000mm+/-1% (test by TIROPTICS OPTOMATIC2000 made in German) Length: 2mm-3mm +/-0.1mm Width: 2mm-150mm+/-0.1mm Tc tolerance:+/-0.2mm Centration: 3-5' Surface accuracy:lambda/2 Surface quality: 40/20 Clear aperture: 90% Coating: custom design Besides, there are a large volume of stock optical components in various shapes and sizes to facilitate quick deliveries.