From the Hoegh Meniscus to Double Anastigmats

Max J. Riedl

doi:10.1117/3.835815.ch19

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Chapter 19:
From the Hoegh Meniscus to Double Anastigmats

Book: Optical Design: Applying the Fundamentals

Author(s): Max J. Riedl

Published: 2009
https://doi.org/10.1117/3.835815.ch19

Abstract

19.1 Introduction This chapter outlines the design steps for several photo objectives in an evolutionary way. Beginning with a single element, the HÃ¶egh meniscus, we progress by adding elements. Two elements lead to the Hypergon, a symmetrically arranged doublet. In the next step, the two lenses are shaped into cemented achromats. Finally, these cemented achromats are split into airspaced achromats, which leads to an arrangement referred to as a double anastigmat. In the final optimization, we break the symmetry and change the radii of the second achromat. The configuration is an excellent general-purpose lens with a relative wide angle coverage. 19.2 HÃ¶egh Meniscus Emil von HÃ¶egh reasoned that if both radii of a meniscus are equal, the Petzval curvature must be zero. Furthermore, if the stop is placed at the proper position, astigmatism can be eliminated. This arrangement is shown in Figure 19.1.

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CHAPTER 19

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