The three-axis lens mount allows for either wall or ceiling installation.

Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.

In fact, it is not like the film and moving the camera is similar to the place, but, with the film is a movement of the follower movement along the axis of the lens, it is relatively fixed picture.