We can process all kinds Aspheric condenser lenses, Parabolic Mirror and Off-axis Parabolic Mirror. Aspheric condenser lenses efficiently correct for spherical aberrations and coma. For this reason, one aspheric condenser can replace a multiple spherical element design. This replacement reduces the number of back reflections and ultimately yields higher transmission. Material: Bk7 B270 Center Thickness Tolerance: ¡À0.1mm Surface Quality: 120-80 80-50 Centration: 3 arc min Fringes: ¦Ë/2 Clear Aperture: 85% Aspherical mirror used in reflecting optical systems, such as astronomical telescopes. Material: Bk7 Quartz Zerode Glass Center Thickness Tolerance: ¡À0.1mm Surface Quality: 60-40 Centration: 3 arc min Fringes: ¦Ë/2 ¦Ë/4 Clear Aperture: 90% Dispersion: 0.01-0.03