Abstract: A method for automatic focusing of a microscope with a microscope objective on a selected area of a specimen, in which a digital hologram of the selected area of the specimen is generated in an off-axis mode and a microscope with which the method is implemented. The digital hologram is used to determine, on the optical axis of the microscope objective, a focus position to be set in which the selected area of the specimen is optimally in focus. Subsequently, a control system is used to set the microscope to the focus position determined and thus is focused on the area selected.

Abstract: An objective for a camera defines an axis and includes an inner objective element and an outer objective element at least partially surrounding the inner objective element. The inner objective element and the outer objective element conjointly define an interface and are mounted so as to be rotatable relative to each other about the axis. A sealing system is disposed at the interface between the inner objective element and the outer objective element and the sealing system includes a plastic foil in contact engagement with the inner objective element and the outer objective element.

Abstract: An optical image offset device for compensating for or producing a lateral offset of an image of an observation object (41) in an optical observation device (33) is provided. The optical image offset device comprises at least two optical wedges (1, 3) which are arranged successively along an optical axis (OA) and which are respectively composed of at least two optical elements (5, 7, 9, 11). Each optical wedge (1, 3) has an adjustable wedge angle (?, ?) Furthermore the optical wedges (1, 3) have different refractive indices and different dispersions.

Abstract: A method is provided for image stabilization in an optical instrument (1, 101) with observation optics (3) that have an optical axis (OA) and at least one optical element with adjustable refractive power (7, 7A, 7B, 177), an unintended movement taking place between the observation optics (3) and an observation object (4) along the optical axis (OA). The unintended movement along the optical axis (OA) is determined and on the basis of the movement determined, at least one control variable for the adjustable optical element (7, 7A, 7B, 177) is determined, which represents the refractive power of the optical element with adjustable refractive power (7, 7A, 7B, 177) necessary for optical compensation for the movement along the optical axis (OA). An adjustment of the optical element with adjustable refractive power (7, 7A, 7B, 177) is carried out on the basis of the control variable.