Triplet Achromatic Lenses are designed for 1:1 conjugate ratios and utilize symmetry to correct for aberrations. They are made from a low index center element cemented between two identical high index outer elements. Each lens is edged down to f-numbers with reasonable aberration correction at increased fields. Some medical instrument use micro triplet lenses.

Specifications:
Materials:1pc crown glass with low refractive index and 2pcs of flint glass with high refractive index
Diameter:1.5—300mm
Diameter Tolerance:+/-0.1 mm
Thickness Tolerance:+/-0.5mm
Centring Error<3 Arc minutes
Surface Quality:20—10
Surface Figure:λ/10@633nm
Clear Aperture:90%
Coating: Specified by customers