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Optical Objective Systems: A Schematic Guide

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Warren J. Smith, Rockwell Collins Optronics

Simple Meniscus Lens The simple meniscus lens is almost universally used in inexpensive cameras. To get an image of good quality it must be used with a separate aperture stop, reducing the aperture of the lens and the aberrations and their effects. The stop also selects the pencil of off-axis rays that passes through the lens; this controls astigmatism and eliminates coma. Spherical and chromatic aberrations and field curvature are totally uncorrected, but are rendered tolerable by the low speed —about f/10 to f/15. Distortion is uncorrected. The stop may be before or behind the...Read full article

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