The Work of the Lens Designer. Meridional Ray Tracing. Paraxial Rays and First-Order Optics. Chromatic Aberration. Spherical Aberration. Design of a Spherically Corrected Achromat. Oblique Pencils. Coma and the Sine Condition. Design of Aplanatic Objectives. The Oblique Aberrations. Lense in which Stop Position Is a Degree of Freedom. Symmetrical Double Anastigmats with Fixed Stop. Unsymmetrical Photographic Objectives. Mirror and Catadioptric Systems. Eyepiece Design. Automatic Lens Improvement Programs. Index.