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Reference.org
Prontor-Compur
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<p>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 <a href="/facts/Flash_synchronization/1gR9tEux">synchronize</a> the <a href="/facts/Shutter_(photography)/83Y5rsB0">shutter</a> to the <a href="/facts/Flash_(photography)/bfegk3Xy">flash</a>. </p>