Abstract: A binocular telescope with internal focusing and two cylindrical barrel tubes, each fastened to a bridge and accommodating an objective lens, a focusing lens, a prism system for image inversion and an eyepiece. The prism system is configured so that the optical axis of the eyepieces is offset relative to the optical axis of the objective lenses. The bridge is provided with two cylindrical apertures in which the barrel tubes are mounted parallel to one another, each rotatable about the optical axis of its objective. Each barrel tube comprises a rotary sleeve, an objective tube and an eyepiece tube. The bridge is one piece and has a small length compared to the barrel tube length. The rotary sleeves are inserted into the apertures and the objective tubes and eyepiece tubes are connected to the rotary sleeves such that they lie rotatable on the upper and lower sides of the bridge.

Abstract: A binocular telescope with internal focusing and two cylindrical barrel tubes (2, 3) each fastened to a bridge (1) and accommodating an objective lens (4, 5), a focusing lens (6, 7), a prism system (8, 9) for image inversion, and an eyepiece (10, 11), wherein the prism system (8, 9) is configured so that within the barrel tubes (2, 3) the optical axis (12, 13) of the eyepieces (10, 11) is offset relative to the optical axis (14, 15) of the objective lenses (4, 5), is characterized in that a rigid bridge (1) is provided with two cylindrical apertures (16, 17) in which the barrel tubes (2, 3) are mounted parallel to one another and each rotatable about the optical axis (14, 15) of the respective objective (4, 5), wherein the barrel tubes (2, 3) each comprise a rotary sleeve (18, 19) and an objective tube (20, 21) and an eyepiece tube (22, 23) connected thereto, the bridge (1) is constructed in one piece and has a small length compared to the length of the barrel tubes (2, 3), the rotary sleeves (18, 19) are ins

Abstract: The application describes an automatic focusing system for photographic cameras. The system functions by means of an infrared light source and an infrared detector. The infrared radiation is focused as a function of object distance in such a manner on the detector that this detector is divided into two detector segments each of which supplies a partial current of which the ratio depends directly on the object distance. The detector is followed by an electronic computing circuit which sets the objective as a function of a preselection implemented by a switch to one of the following modes of operation:(a) the focus is on the object to be photographed(b) the depth of field is extended from the object toward the camera(c) the depth of field is extended from the object to the rear(d) the depth of field is extended from the object to infinity(e) the depth of field is extended to between two consecutively targeted objects.

Abstract: A microfiche and a microfilm reader comprising automatic positioning of the film stage, characterized by the following features:(a) the microfiche (MFK) is provided with an index (2) of the information present in its individual images and of their x,y coordinates in optically coded form and with a timing track (4),(b) the reader comprises a read head (19) with electronic-optical sensors to read the optically coded index on the microfiche (MFK),(c) an electronic read/write memory (20) for storing the index (2) is connected to the read head (19),(d) provision is made for an alphanumeric keyboard (27) to feed-in a search concept (search key) and followed by an encoder (26) and a register (25) for storing the coded keyboard input,(e) a comparator (24) is connected to the memory (20) of the index (2) and the register (25) of the coded keyboard input, which determines the agreement between the search key and a concept present in the index,(f) the comparator (24) and the memory of the index are followed by appropria

Abstract: A still camera with a fold up cover, a retracting objective and a drive connection between these components acting within the light tight camera space on the objective mount so that the objective is advanced when the cover is opened and retracted when the cover is shut.The camera has the following features:(a) the drive connection is divided into outer drive links (4-5, 6, 7) and inner drive links (10, 11);(b) the outer drive links (4-5, 6, 7) are connected with the cover (3) so as to positively control the cover;(c) the inner drive links (10, 11) are connected with the objective mount (2) so as to positively control the mount; and(d) the connection between the outer and inner drive links consists of a round shaft (8) supported in a bore (9) of the housing (1) with a light tight snug fit.

Abstract: A reading device for viewing microfilms, transparencies, fiches, and the like, comprising a plate-shaped projection screen made of transparent material supported on a frame structure with the projection screen disposed in a slanted position relative to the horizontal. The screen has on the viewing side a frosted surface and on the opposite side prism-shaped parts. A source of light is disposed into the frame structure beneath a carrier for placing an article to be projected thereon. A mirror assembly is disposed in the frame structure to reflect light rays passed from the light source through the article to the prism-shaped parts and through the projection screen. The prism-shaped parts are disposed in lengthwise rows and have prism surfaces extending at an angle with respect to the opposite side of the projection screen for deflecting the light rays reflected from the mirror assembly so as to project an image of the article within an angle converging toward a viewer situated above and in front of the screen.

Abstract: A collapsible viewing device for viewing microfilm consists of a carrying case with a bottom part to which is hinged a lid. The case includes a viewing screen, a supply of light, a lever assembly and a spring assembly which, upon opening of the lid, automatically activates the light, moves the screen into its reading position and releasably locks the screen in its viewing position. Closing of the lid against the action of the spring assembly returns the screen into the position in the bottom part of the case against the action of the spring assembly and disconnects the light.

Abstract: A camera has a telescoping housing and an optical viewfinder. A pivotable or sliding member indicates certain data which may be in the nature of exposure information. The member for setting the data is operatively connected to the indicating member in such a manner that the indicating member is additionally pivoted or slid upon telescoping of the housing and the indicating means returns to its previous indicating position upon extension of the telescoped housing.

Abstract: A sub-miniature camera has a rotatable winding knob which moves the film and cocks the shutter of the objective. A slide is movable by the knob between initial and end positions and blocks a release button from actuation when the slide is in its initial position and releases the button when the slide is in its end position. The slide is provided with a slot through which passes a rod of the release button and the slot and rod co-act to block and unblock the release button. The shutter is operated electrically by contact means closed by the slide moving to its initial position. The slide also actuates an exposure counter and the exposure counter is returnable to the zero counting position upon opening of the camera housing.