Abstract: The invention is directed to a microscope having a binocular tube of the Siedentopf type. With this microscope, two different viewing elevations can be adjusted at a fixed viewing angle notwithstanding the simplest mechanical and optical configuration. The optical configuration of the microscope is achieved in that the first tube arm is journalled so as to be freely rotatable on the microscope support about the optical axis. The second tube arm is journalled on the first tube arm so as to be rotatable about the common optical axis.

Abstract: A microscope tube contains prisms mounted on a prism carriage switchable between a position for visual observation of a specimen and a position for photometry or photography of the specimen. A diaphragm (6) mounted on and movable with the carriage has a blocking position impeding entrance of light through the eyepiece window of the tube, and an ineffective or non-blocking position which does not impede entrance of such light. A manually operable handle in the form of a knob (9) mounted externally of the tube controls mechanical linkage parts (8, 10, 11) for shifting the diaphragm from its blocking position to its non-blocking position when the carriage is in the photometry or photography position, in case the user may wish to make a visual inspection of the specimen at that time.

Abstract: A microscope tube having several sections articulated with respect to each other. A first stationary section (1) is hinged to a second section (2) which can swing upwardly and downwardly, and this is hinged to a third section (3) which hangs downwardly from the second section, the free lower end of the third section being swingable horizontally toward and away from the observer or user of the microscope. The third section has a fourth section (4) hinged to it to tilt on a horizontal axis, and this fourth section carries the eyepiece of the microscope. With this arrangement, the eyepiece may be adjusted to various positions vertically and horizontally to suit the comfort of the observer, and may be tilted to various viewing angles quite independently of its vertical or horizontal position. Mirrors within the tube at the hinge joints direct the optical beam properly from one section into the next section, and these mirrors turn through half the angle of swing when one section swings relative to the next.