Photographic Optics: Including the Description of Lenses and Enlarging Apparatus (Classic Reprint) - Hardcover

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Excerpt from Photographic Optics: Including the Description of Lenses and Enlarging Apparatus

The five aberrations of most interest have been the object of our especial care.

A radiating point of homogeneous colour) being placed at infinity, and in the axis of a convergent lens, emits parallel rays, which on emerging from the lens do not meet at one point in the axis; and therefore the image of the point is surrounded by a circle of diffused light, called the circle of spherical aberration. If the point is placed some degrees out of the ax1s, the circle of aberration becomes elliptical; and if the point is very obliquely placed, its image takes the form of a comet. We have carefully examined the conditions necessary to reduce this spherical aberration to the minimum by the employment of the diaphragm, or better by joining to the convergent lens a divergent lens, with appropriate radii of curvature, which makes the combination aplanatic, that is, free from spherical aberration along its axis.

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