Abstract: A microtome has a sectioning apparatus that comprises a microtome blade, for sectioning histological samples into thin prepared sections. The microtome is characterized in that an optical reading apparatus is present which reads an optically readable image pattern on the microtome blade, generates analog or digital image signals corresponding to the read image pattern and conveys the image signals to a control apparatus of the microtome.

Abstract: A microtome has a sectioning apparatus that comprises a microtome blade, for sectioning histological samples into thin prepared sections. The microtome is characterized in that an optical reading apparatus is present which reads an optically readable image pattern on the microtome blade, generates analog or digital image signals corresponding to the read image pattern and conveys the image signals to a control apparatus of the microtome.

Abstract: A photographic camera having an interchangeable lens and an automatic exposure control and focusing device comprising a computing circuit for the determination of the front and rear depth-of-field planes. The computing circuit is connected to a data memory on the camera side, a control unit, an autofocus central unit and an exposure control device. At a given stored sharpness and open aperture, the front and rear depth-of-field planes are automatically controlled by means of a setting element and can be assessed in the viewfinder. A predetermined depth-of-field range can be set and the required aperture can be displayed in the viewfinder and set, if this aperture is present on the interchangeable lens. The controlled depth-of-field planes remain visible in the viewfinder for a predetermined period of time.