Detailed Product Wanted Description

Changchun Hengyi Optics Co., Ltd could produces all kinds of cemented Lenses, such as Achromatic cemented-double, Achromatic cemented-triple and Achromatic cemented-four etc.

Achromatic-Doublets
	Computer-optimized for infinite conjugation
	Excellent performance
The achromatic-doublet consists of a positive low-index(crown) and a negative high-index(flint)lens. These lenses are computer-optimized for infinite conjugate ratio. They also exhibit excellent paraxial performance, minimal spherical aberration, coma and smallest chromatic aberration. When used for focusing or collimating, the convex lens or the smaller radius surface always faces the collimated light, while used to image the convex lens must be adjacent to the object or image with longer distance.
Material: Optical glass(crown and flint)                            Fringes: 1-5
Focal Length(f'): 2% more or less
Irregularity of Fringes: 0.1-0.5
Diameter Tolerance:  -0.10mm
Surface Quality: 20-10 scratch-dig
Center Thickness(Tc): 0.1mm more or less
Coating:  Specified by customers
Centration:  1-3 arc minutes
Clear Aperture: 90% 

Air-Spaced Achromatic-Doublets
	Large aperture
	Exceptional optical quality
The achromatic lenses with large aperture are air-spaced. All the air-spaced achromatic doublets show exceptional performance and provided with mounts.When used for focusing or collimating, the convex lens or the smaller radius surface always faces the collimated light, while used to image, the convex lens must be adjacent to the object or image with longer distance.
Material: BK7 , fine annealed or other materials
Fringes: 1-5
Focal Length(f'): 2% more or less
Irregularity of Fringes: 0.1-0.5
Diameter Tolerance:  -0.10mm
Surface Quality: 20-10 scratch-dig
Center Thickness(Tc): 0.1mm more or less
Coating:  Specified by customers
Centration:  1-3 arc minutes
Clear Aperture: 90%