November 2012
Beginner
608 pages
30h 31m
English
Content preview from The Manual of Photography, 10th Edition
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Chapter | 10 |
Camera lenses
LENS ABERRATIONS
Introduction
An understanding of residual aberrations (errors) is useful in describing the types, merits and imaging limitations of camera lenses. An ‘ideal’ lens forms geometrically accurate images but actual lenses, especially simple ones, do not since the refractive index of glass varies with wavelength, lens surfaces are usually spherical in shape and because of the wave nature of light (see Chapter 2). These cause respectively chromatic aberrations, spherical aberrations and diffraction effects. The degrading effects usually increase with both aperture and angle of field.
There are seven primary chromatic and spherical aberrations. Two ...
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