Positioning distance

The positioning distance is at film-technical devices, the distance between the / / en authoritative mechanical positioning member and the optical axis . Positioning organs are a simple gripper, a tooth of multi-toothed grippers, one or a pair of locking pins or fixed locating pins.

In the ideal case, the positioning distance would be zero, so that a pair of film holes at the level of the optical axis on both sides of the image window comes into contact with positioning elements. This ideal is only nearly realized with one film camera, namely the Debrie GV

In the classic cinema cameras from Bell & Howell, Debrie, Mitchell, Arnold & Richter, Vinten, Newall, Panavision, Leonetti and others, there are fixed alignment pins or moving locking pins at least one hole distance away from the picture window . There is no standard regulation for the positioning distance for normal film .

The situation is different with 16 mm cine film . DIN 69 specifies from which hole, counted from the optical axis, the gripper should set down. When small film 8-R (egular) one has chosen the same positioning distance. It was in effect as the norm in the United States. For Super-8 / Single-8 you can fall back on ISO 1781 and 1787.