Abstract: A method of determining a plant's biomass includes three steps, namely establishing an X-ray photograph of the plant, establishing an absorption characteristic of the plant in an X-ray photograph, and determining the plant's biomass by means of the absorption characteristic of the plant. Said determining is based on a predetermined relation between a reference absorption characteristic and a reference biomass.

Abstract: A method of determining a plant's biomass includes three steps, namely establishing an X-ray photograph of the plant, establishing an absorption characteristic of the plant in an X-ray photograph, and determining the plant's biomass by means of the absorption characteristic of the plant. Said determining is based on a predetermined relation between a reference absorption characteristic and a reference biomass.

Abstract: An optical observation apparatus with at least one observation beam path and with means for laser range-finding, which have at least one transmitting device and at least one receiving device and are arranged outside the at least one observation beam path. The transmitting device and the receiving device are arranged in each case in separate housing parts of the optical observation apparatus and/or, if a folding bridge of the optical observation apparatus is present, along a mid-axis of the folding bridge. At least one diffractive optical element is provided for shaping at least the receiving beam for the at least one receiving device.

Abstract: The invention relates to an optical observation apparatus (1) with at least one observation beam path (4) and with means (7) for laser range-finding, which have at least one transmitting device (8) and at least one receiving device (9) and are arranged outside the at least one observation beam path (4). The transmitting device (8) and the receiving device (9) are arranged in each case in separate housing parts (10a, 10b) of the optical observation apparatus (1) and/or, if a folding bridge (5) of the optical observation apparatus (1) is present, along a mid-axis (6) of the folding bridge (5). At least one diffractive optical element (9b) is provided for shaping at least the receiving beam (9a) for the at least one receiving device (9).

Abstract: A telescope has at least one barrel. At least three optical elements, namely an objective lens, an inverting system, and an eyepiece are arranged within the barrel along a longitudinal axis thereof one behind another. Further, shaking movements of the barrel are compensated for by moving at least one of the optical elements relative to the barrel. The objective lens is rigidly connected to the barrel. The inverting system together with the eyepiece constitutes a common assembly. At least a part of the assembly is adapted to be moved relative to the longitudinal axis. As an alternative, the inverting system and the eyepiece are rigidly connected to the barrel and at least a part of the objective lens is adapted to be moved relative to the longitudinal axis.

Abstract: A telescope has at least one barrel. At least three optical elements, namely an objective lens, an inverting system, and an eyepiece are arranged within the barrel along a longitudinal axis thereof one behind another. Further, means are provided for compensating shaking movements of the barrel by moving at least one of the optical elements relative to the barrel. The objective lens and the eyepiece are, preferably, rigidly connected to the barrel. The inverting system is adapted to be moved transverse to the longitudinal axis.

Abstract: A telescope has at least one barrel. At least three optical elements, namely an objective lens, an inverting system, and an eyepiece are arranged within the barrel along a longitudinal axis thereof one behind another. Further, means are provided for compensating shaking movements of the barrel by moving at least one of the optical elements relative to the barrel. The objective lens is rigidly connected to the barrel. The inverting system together with the eyepiece constitutes a common assembly. At least a part of the assembly is adapted to be moved relative to the longitudinal axis. As an alternative, the inverting system and the eyepiece are rigidly connected to the barrel and at least a part of the objective lens is adapted to be moved relative to the longitudinal axis.