Abstract: The stereoscopic film cartridge is for a stereoscopic viewer having binocular eyepieces and a film driving device. It comprises a thermally formed elongated film tending to roll around itself; and a housing for housing the film, the housing being provided with a first opening arranged to permit engagement of the film driving device with the film when the cartridge is mounted onto the stereoscopic viewer. The housing includes two opposite compartments and a guiding channel extending between the inlets of the compartments, for guiding the film between the inlets. The channel has a front panel provided with right and left adjacent viewing windows, the front panel having an inner surface provided with a first pair of upper and lower parallel projecting bands; and a rear panel comprising translucent means, the rear panel having an inner surface provided with a second pair of upper and lower parallel projecting bands facing respectively the first pair of bands.