| Celor | |
| Scheme: | Celor lens (Wix).svg |
| Year: | 1898 |
| Author: | Emil von Hoegh |
| Elements: | 4 |
| Groups: | 4 |
| Aperture: | 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.
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 and versions; in 1904, the faster version was renamed to the Celor and the version was renamed to the Syntor.[3]
Similar four-element air-spaced symmetric dialyte lenses were released by Steinheil (Unofocal, 1901), Kodak, and Taylor, Taylor & Hobson (Aviar, 1917).[3]