F2 pin registered cameras
Nikon did not make any pin registered F2's, but a number of specialist photo companies did. These cameras have modified bodies and extra bumps on their backs to push pins into the body to ensure every frame is aligned to each other, for animation/multi exposure/multiple protection purposes.
An early F2 pin registered camera. The unit is machined out of solid aluminium. The pins are activated by a standard cable release at the front. I don't know who made it, but I have four in my collection. R I Harding, England
Double M Industries, USA Slide Magic, USA
TCD, UK Oxberry, USA