The achromatic lens is a simple solution to reduce chromatic aberration. It is a lens consisting of one group of two or three lens elements of different glasses, which may be cemented, and designed so that the chromatism of one element is offset by that of the other. An old landscape lens may consist of such a group, i.e. a biconvex crown glass element and a biconcave flint glass element. Other achromatic lenses use other variants of concave flint and convex crown glass. Many box cameras have a meniscus achromat. In addition to the correction of chromatic aberration, Greenleaf (1950) states that compared with the simple meniscus lens, a skillfully designed meniscus achromatic lens exhibits also reduced spherical aberration and coma.[1]

Edmund Scientificcatalog

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Two such achromats, arranged symmetrically, form a Rapid Rectilinear (or Rapid Aplanat), which corrects more lens aberrations.

Soft cover. Condition: As New. No Jacket. Excellent condition! Like new. Seventh Edition 1987. Just purchased a high powered telescope 18 months ago and this book would have come in REALLY handy. (BR) Box 89.

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Paperback. Condition: Very Good. book has light wear to edges of spine, light corner wear, light shelf wear, light toning to cover, otherwise solid clean shape.