3D on 16 mm film made with an attachment that fastens to the lens turret of a Bolex camera. The two openings at the front of the attachment are separated by 2½ in. (64 mm) to approximate the average distance between our eyes. Two prisms redirected light through the smaller Kern lenses (5.3 mm apart) and onto the film (see diagram below). The 16 mm frame was effectively split in half vertically for the left and right frames.

A special lens was required for the projector as well. The side-by-side images were projected through orthogonal polarizing filters. When viewed through similarly polarized glasses, the left image was visible only to the left eye and the right image to the right eye. To preserve the polarization, the film had to be projected onto an aluminized screen instead of the standard diffuse white screen. A special Bolex screen was available with black margins to hide the edges of the images where they didn't overlap (Kern Paillard 1953b).

The format lasted only a couple of years on the market. The narrow image was a limitation, as well as the reduced horizontal resolution. The lens attachment, polarized glasses, special projector lens and special screen made the system a little too complex for amateurs. Finally, the attachment was designed for the Bolex H16 camera and didn't carry forward easily to later Bolex models (Hess 2024).