The achromatic doublet lens is used to minimize or eliminate chromatic aberration. Its achromatic design also helps to minimize spherical aberration. Compared with a single lens, an achromatic doublet ...

Achromatic lenses and semi-plan lenses are used to improve the alignment of colors at the focal point in order to provide a clearer image. They differ in terms of glass type, cost, and index of ...

Charles Chevalier created an achromatic lens that could control both chromatic and spherical aberrations. However, this meant that the aperture at the front was quite small (f/16), taking the ...

Huygenian Huygens eyepieces are constructed of two plano-convex lenses with both plane sides facing the eye. Periplan Periplan eyepieces are constructed of one achromatic doublet and two plano-convex ...

Because the design of these lenses are complete symmetrical, so they can be used by changing-over. The commonly used materials include crown glass and flint glass. Triplet Achromatic Lenses are ...