Optical adapter for mounting camera lenses on a video camera

An adapter for adapting at least one objective to a camera, wherein

• the camera is a video camera comprising a spectral splitter of light into three spectral bands, and three receivers each associated with one spectral band, the three receivers having a same first format, distances between an entrance of the spectral splitter and sensitive surfaces of the receivers being different for the three spectral bands;
• the objective is a cine-camera objective with only one image focal plane for all three spectral bands and has a second given format;
• and in that the adapter comprises:
• first optical means conveying images between an image focal plane of the cine-camera objective and the sensitive surfaces of the receivers;
• second optical means achieving a relative axial offset of the three spectral bands so that the differences in distance are compensated for, so that an image corresponding to each of the spectral bands is formed at a level of the sensitive surface of the associated receiver;
• said first and second optical means of conveyance and offsetting having an overall magnification that changes the format of the image of the cine-camera objective into a common format of the receivers.