Septum

Glossary Terms

Septum (collapsible & removable) in an Ernemann Heag stereo camera image by Geoff Harrisson (Image rights)

In stereo cameras, a septum is a thin partition separating the two halves of the camera, so that light from the left lens does not reach the right-hand part of the film or plate. The same word refers to similar structures in biology: the flesh dividing the two nostrils, or the thin tissue separating parts of a poppy-seed head.