An achromatic doublet lens has two elements cemented together, one a positive lens and the other a negative lens. The chromatic aberration is almost completely corrected for, and at the same time spherical aberration is reduced nearly to zero. Whenever po

However, the design of an achromatic doublet lens lends itself to the sort of calculation we are doing in this chapter. A combination of two lenses in contact, a converging lens made of crown glass and a weaker diverging lens made of flint glass, can be d

Athermal AND Achromatic Doublet. Frequently, the achromatic doublet is designed separately from its mount, metering structure, and the detector. If athermal condition is required, this often leads to an opto-mechanical design similar to Figure 1b. However