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Celor lens 
Summary
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.
 | |
| Introduced in | 1898 |
|---|---|
| Author | Emil von Hoegh |
| Construction | 4 elements in 4 groups |
| Aperture | f/4.5 and 6.3 |
Design edit
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 edit
- ^ a b Geary, Joseph (2002). "Celor Lens". Introduction to lens design with practical ZEMAX examples. Richmond, Va: Willmann-Bell. ISBN 978-0-943396-75-0.
- ^ 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.
- ^ a b 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.