Abstract: Optical adapter for adapting cine-camera objective to video camera, which includes spectral splitter of light into three spectral bands, and three receivers each associated with one spectral band, the three receivers having the same format, the distance between the entrance of spectral splitter and the sensitive surfaces of the receivers being different for three spectral bands. The objective is a single-image focal plane objective for all three spectral bands and has a second given format. The adapter includes first optical device conveying image between the image focal plane of the objective and the sensitive surfaces of the receivers, and second optical device achieving a relative axial offset of the three spectral bands so that the differences in distance are compensated for. The first and second optical devices have overall magnification changing the format of the image of the objective into the receiver common format.

Abstract: A lighting apparatus has a lighting filament (3), a first lens (1) disposed at a fixed distance from the filament (3), divergent light from the filament falling directly on the first lens (1) which reduces but does not eliminate the divergence of the light in all directions about the optical axis upon passage of light through the first lens, and a sleeve (12) carrying a second lens (2) mounted for sliding movement relative to the box. The second lens (2) receives divergent light directly from the first lens (1) and reduces the divergence of the light upon passage of the light through the second lens, the focal length of the second lens being greater than 1 1/2 times the focal length of the first lens and the distance between the lenses being less than 1 1/2 times the focal length of the first lens. The illumination pattern is high-intensity but does not have a sharp contour so that it may be used in a surgical operating room.

Abstract: An optical system is adapted to conjugate an object plane with an image spherical dome whose radius is less than its focal length and whose exit dioptric is a spherical dome on which the image spherical dome is substantially superimposed. The optical system can be used in an exposure device for modifying by physical-chemical treatment the power profile of an artificial optical lens made from a photopolymerizable material. The device comprises a source of radiation and between the source of radiation and the artificial optical lens to be irradiated a mask adapted to modulate the energy flux spatially. The exposure device comprises a curved field lens system formed by the optical system.