Abstract: A camera includes a central processing unit which determines the exposure of the film in accordance with the zone method. A light measuring device, a diaphragm data device, a maneuverable film sensitivity switch, and a development type switch generate the data signals necessary for determining the exposure. A zone selection device and a reference point selector are also provided. The camera user selects a reference portion of the photographic subject, which is seen in a viewfinder, by means of the reference point selector and, by means of the zone selection device, chooses which zone the reference portion is to be represented by on the film. The central processing unit calculates the necessary shutter speed in accordance with the choice of the user and shows the result on a display. The zone in which an arbitrary comparison portion of the photographic subject would be represented is determined and shown on the display.

Abstract: An electrical contact unit electrically connects a first main member, e.g., a camera housing, with a second main member, e.g., a camera lens, which is mountable on the first main member. The first main member is provided with a contact cradle, which has first electrical contacts, e.g. pins, and a rolling or sliding member. The contact cradle is rotatably mounted on a cradle axle. The second main member is provided with second electrical contacts and a receiving recess. When the second main member is in a first mounting position, it presses against the rolling or sliding member so that the contact cradle assumes a retracted position, in which none of the first electrical contacts are in contact with the second main member.

Abstract: An electrical contact unit is provided for a first main member, which has a mainly planar first mounting surface, and for a second main member, which has a mainly planar second mounting surface and is mountable on the first main member. The first mounting surface and the second mounting surface lie against each other when the second main member is mounted on the first main member. The first main member comprises a male contact member, which has an outer surface and carries electrically conductive male contacts, and a maneuvering pin, which extends out from the outer surface. By means of guide elements, the male contact member is mounted in the first main member for motion generally perpendicular to the first mounting surface between an outer position and an inner position.

Abstract: The invention relates to a device at a slide projector for adjusting the slide guide in a plane perpendicular to the optical axis (A--A) of the projector. First fixing means (6-8) are provided to connect a central portion of a first side of the slide guide (2) to the projector. Second and third fixing means (9-15) are located separated from each other on a side of the slide guide (2) opposed to said first side to connect the slide guide to the projector, which second and third fixing means (9-15) are capable to independently of each other adjust and fix the slide guide in the direction of the optical axis (A--A).

Abstract: The invention relates to a device for detachably attaching a lens tube (2) to a lens barrel (1). It is characterized in that the lens barrel inside its forward free edge (5) is provided with peripheral grooves (3) extending in the same plane, the respective bottom of which at the ends (9) of the groove inclined in said plane transforms into the shell surface of the barrel (1), which shell surface tapers conically (6) to the free edge (5) of the barrel. A guide shoulder (4) tapering in wedge-shape thereto is located on the shell surface between two adjacent grooves (3). The tube (2) is provided with radially resilient hooks (11) capable at mounted tube (2) to engage with the grooves (3) of the barrel (1).

Abstract: This invention relates to a focusing hood for cameras comprising a cover (2) mounted at the camera box for being folded up, and lateral pieces and a back piece (3) mounted at the cover, the respective lateral piece divided into a front lateral piece portion (4) and a rear lateral piece portion (5) hingedly attached to each other. The back piece (3) further is connected to the box by means of a link hinged at the box and back piece. The invention is characterized in that the link consists of a first portion (8) hingedly mounted on the box and a second portion (10) hingedly mounted at the back piece (3) on a level vertically beneath the center thereof at folded-out focusing hood, and at the first portion (8) substantially on a level at half the height of the back piece.

Abstract: The invention relates to a device for data recording at photographic cameras equipped with a separate film magazine. The device according to the invention is characterized in that it is designed as a separate unit (3), which can be attached detachably on the film magazine (1), and which comprises a microprocessor (8) for controlling predetermined information and a necessary power source (9) as well as optical means (5,13) for information transfer to the emulsion side of the film (1) while the film is being advanced.

Abstract: A slide projector for interchangeable circular slides magazines comprising downwardly open slide compartments (2) is provided with a mechanism, the double function of which is to lock the slide compartments and to release the slides magazine from the slide projector and, respectively, to release the slide frames (3) in the slide compartments (2) and to couple the slides magazine to the slide projector. The mechanism comprises an eccentric plate (28) which is located on the slide projector and upon rotation moves a locking ring (5) located in the slides magazine for the slide frames (3) at the same time as the eccentric device effects the coupling between the slide projector and the slides magazine. Mechanical (36) and electric (39) safety devices render slides magazine exchange prior to completed slide change impossible and, respectively, render slide change impossible while exchange of slides magazine is going on.

Abstract: The invention relates to an automatic device for protecting the focal plane shutter of a camera when the camera is open. The film magazine of the camera, alternatively the camera back, is sensed by a member disposed in the camera body and directly or preferably indirectly controlling the shutter electronically. When the camera is opened, the sensing member emits a control pulse, which releases the opening part of the shutter. The opening and closing parts of the shutter then are located on both sides of the film gate of the camera where they are protected against damage. When the camera again is closed, the opening part of the shutter again must be cocked. Alternatively, also the closing part of the shutter can be released by a control pulse released when the camera is being closed. The protective device is lockable. (FIG. 2).