ions the axial chromatic aberration can be minimized—that is, two colors such as red and blue—may be brought to afocus at the same point and the other colors be made to focus veiyclose to this point. 2. Obuque) Chromatic Aberration.—Even when all the colorsare focused at the same point the… … TUlyerlShidtz J Axial Aberrations of Lenses 345 objects. A particular example of this is found in the lenses usedin three-color photoengraving, where if the focal length for the redis slightly longer than that for the blue, there will be a red fringeto the image. This error is known as oblique…
Lenses and optical systems
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