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) used in photography to synchronize the shutter to the flash.
Etymology [ edit ]
"Prontor" has its origins in the Italian word "pronto", meaning ready (and was a leaf shutter made by Alfred Gauthier [de]). "Compur" is derived from the word "compound" (the "Compound [de]" was a long-lived series of leaf shutters made by Friedrich Deckel [de]).
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 [de] (which made the Prontor-S and Prontor SV models, amongst others) and Deckel [de] (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, owing to the fact that the Zeiss organisation held a significant shareholding in both of these companies prior to the introduction of the shared connector. By the 1950s, Gauthier were manufacturing up to 10,000 Prontor shutters daily.
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
- History of flash photography. http://www.photomemorabilia.co.uk/Ilford/Flash_History.html
- Timeline of Prontor company. http://www.prontor.de/go/unternehmen-firmengeschichte/english.html