Achromatic Lens is an achromatic consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element. China Star Optics can provide Positive Achromatic Lens and Negative Achromatic Lens by two piece single lens (Doublets) or three piece single lens (Triplet).
Specification of our achromatic lens as follow:
*Material:BK7, ZF2, ZF7(or according to your request)
*Dia.:+0/-0.05
*Center thickness tolerance:+/-0.1
*Surface quality: 60-40 Scrath/Dig
*Surface figure:0.5-0.2
*Centration < 3arc min
*Chamfer:0.1-0.25*45 degrees
*Design wavelength:486.1mm, 587.6mm, 656.3mm
(the parameter is dimension of normal lens, so specification will be changed according to different dimension and material)