Technical parameters:Wavelength 632.8nm,Focal length toleranc ±1%,Diameter tolerance +0.0/-0.1mm,Thickness tolerance ±0.1mm,Surface accuracy λ/4,Surface quality 40-20,Centration ＜3arcmin,Clear aperture＞90%,Bevelling ＜0.2×45°,Coating  A: AR Coating 350nm-650nm;B: AR Coating 650nm-1050nm;C: AR Coating 1050nm-1580nm.