1-2 of about 2 matches for site:www.kenrockwell.com polarity
https://www.kenrockwell.com/canon/5ds.htm
PC) terminal for studio and handle-mount flash guns. Works with either polarity. Finder 100% coverage. 71
https://www.kenrockwell.com/canon/5d-mk-iv.htm
Flash NONE . External Flash Dedicated hot shoe. Standard PC (Prontor-Compur) flash sync, works with either polarity.. Light Meters Viewfinder 153