Abstract: A light-emitting element, in particular a light-emitting diode, having at least one light-emitting chip crystal, in particular a semiconductor crystal, is described. At least free surfaces of the light-emitting chip crystal are covered with an inert material—liquid fluid—which is in direct contact with the light-emitting chip crystal.
Abstract: A pair of binoculars has lenses constituting optical filters with a transmissivity range within the wavelength range between about 650 nm and at least 800 nm and also with an additional transmissivity band within a wavelength range from about 310 nm to about 600 nm. The objects viewed with such a pair of binoculars appear as an image that is carried by a satin-finished metallic surface.
Abstract: An objective for use in a night sight device has a front lens group and a rear lens group. The lenses of the front lens group have essentially equal diameters, whereas the lenses of the rear lens group have increasingly large diameters starting from the front end of the lens group.