Celor lens

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Celor
Celor lens (Wix).svg
Introduced in1898
Author Emil von Hoegh
Construction4 elements in 4 groups
Aperturef/4.5 and 6.3

A Celor lens (also known as a symmetric dialyte) [1] is a highly corrected lens of the Dialyt type, designed for process photography, involving reproduction at or near 1:1 scale.

Design

It was developed in 1898 by Emil von Hoegh, as a development of his earlier Dagor lens (1892) designed for the German company Goerz. [1] [2] It was originally named the Double Anastigmat Goerz [Dagor] Type B, sold in both f/4.5 and f/6.3 versions; in 1904, the faster f/4.5 version was renamed to the Celor and the f/6.3 version was renamed to the Syntor. [3] : 100 

Similar four-element air-spaced symmetric dialyte lenses were released by Steinheil (Unofocal, 1901), Kodak, and Taylor, Taylor & Hobson (Aviar, 1917). [3] : 100–101 

References

  1. 1 2 Geary, Joseph (2002). "Celor Lens". Introduction to lens design with practical ZEMAX examples. Richmond, Va: Willmann-Bell. ISBN   978-0-943396-75-0.
  2. ↑ Born, Max (1999). Principles of optics: electromagnetic theory of propagation, interference and diffraction of light . Cambridge New York: Cambridge University Press. p.  265. ISBN   978-0-521-64222-4.
  3. 1 2 Kingslake, Rudolf (1989). "6: The First Anastigmats". A history of the photographic lens (1st, hardback ed.). San Diego: Academic Press. pp. 81–102. ISBN   0124086403.
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