EN: Registration pin
A registration pin is found in the movement certain cameras, such as the Arriflex and the Eclair, and acts to steady the image during exposure.
The Pollio Folio - Glossary of Cinematography Terms
The degree to which one frame lines up with the next frame is registration. A camera with poor registration will create an image that will gently bobble when projected. Projectors too can have good or poor registration (sometimes making it difficult to tell if it was the camera). Good registration is most important for certain types of special effects shots where images are layered and will call attention to themselves if they are gently bobbling out of sync with each other.
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