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Proceedings Paper

Aberration correction and desensitization of an inverse-triplet object lens
Author(s): Ellis I. Betensky
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Paper Abstract

Many objective lenses designed for very high volume production now typically contain aspherical surfaces. One such example is an aspherized version of the traditional Cooke triplet. While these aspherical designs are better than their antecedents, the basic design limitations, astigmatism and manufacturing sensitivities, remain. An inverse triplet having a negative, positive, negative configuration and aspherical surfaces has no all-spherical counterparts, but instead depends on the aspheres to correct the primary aberrations. If a sufficient number of surfaces are aspherical, there are more degrees of freedom than required for aberration correction, so the lens can be optimized to reduce the manufacturing sensitivities by reducing the amount of aberration correction contribution by an individual element.

Paper Details

Date Published: 21 September 1998
PDF: 5 pages
Proc. SPIE 3482, International Optical Design Conference 1998, (21 September 1998); doi: 10.1117/12.322011
Show Author Affiliations
Ellis I. Betensky, Consultant (Canada)

Published in SPIE Proceedings Vol. 3482:
International Optical Design Conference 1998
Leo R. Gardner; Kevin P. Thompson, Editor(s)

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