Re:What does pin registered mean

[Sover . Wong]

Hi Paul,

<snip>The special back has pins which stick up and each frame is advanced an
exact amount by making sure that the edge perforations on the film engage
with the pins on each exposure. <snip>

Is the special back made by Nikon or third party ? I have only seen pin
registered cameras advertised, and not pin registered backs. Can a normal
F2/F3 back be replaced with a pin registered back, without any modifications
? I am not interested to get one, just curious.

Happy shooting,

Sover