Prontor-Compur
 PC-socket, greatly magnified | |||
| General specifications | |||
|---|---|---|---|
| Hot pluggable | Yes | ||
| Audio signal | None | ||
| Video signal | None | ||
| Pins | 2 | ||
A Prontor-Compur connection (also known as a PC connector, PC terminal, or PC socket) is a standard 3.5 mm (1/8") electrical connector (as defined in ISO 519[1]) used in photography to synchronize the shutter to the flash.[2]
Etymology
[edit]
"Prontor" has its origins in the Italian word "pronto", meaning ready (and was a leaf shutter made by Alfred Gauthier).[3] "Compur" is derived from the word "compound" (the "Compound" was a long-lived series of leaf shutters made by Friedrich Deckel).
History
[edit]The term is derived from brands of widely marketed photographic leaf shutters manufactured from the early 1950s by two distinct, but now defunct German companies. Gauthier (which made the Prontor-S and Prontor SV models, amongst others) and Deckel (the Synchro-Compur model, successor to the Compound model).
Both companies' brands, Prontor (from 1953) and Compur (from 1951), shared a common 1/8"-inch coaxial connector for shutter–flash synchronization. This convergence of design is not as coincidental as it might first appear, as the Zeiss organisation held a significant shareholding in both of these companies prior to the introduction of the shared connector.[4] By the 1950s, Gauthier were manufacturing up to 10,000 Prontor shutters daily.
The Gauthier company's essence lives on as Prontor GmbH, which is a wholly owned subsidiary of VTC Industrieholding GmbH.[5] The Deckel company went bankrupt in 1994.[citation needed]
References
[edit]- ^ ISO 519:1974, ISO 519:1992 (1992-11-25). Photography -- Hand-held cameras -- Flash-connector dimensions. Geneva: International Organization for Standardization.
- ^ Axford, Norman; et al. (2000). Manual of Photography: Photographic and Digital Imaging. Focal Press. ISBN 0-240-51574-9.
- ^ History of the Prontor company. http://www.prontor.de/go/unternehmen-firmengeschichte/english.html Archived 2014-06-06 at the Wayback Machine
- ^ History of flash photography. http://www.photomemorabilia.co.uk/Ilford/Flash_History.html
- ^ "Timeline of Prontor company". Archived from the original on 2014-06-06. Retrieved 2014-06-03.
