Abstract: A diaphragm arrangement (100) for generating an oblique illumination in a microscope comprises a carrier element (130), an iris diaphragm element (110) having a variable iris diaphragm opening (111), a further diaphragm element (120) having a diaphragm opening (121) that, when it is in a first position relative to the carrier element (130), covers a portion of the iris diaphragm opening (111) and is mounted rotatably around a first rotation axis (A), such that a rotation of the further diaphragm element (120) around the first rotation axis (A) changes that portion of the iris diaphragm opening (111) which is covered by the further diaphragm element (120), and an actuation element (140) coupled to the further diaphragm element (120) via a coupling device (150) such that a rotation of the further diaphragm element (120) around the first rotation axis (A) is produced by an actuation of the actuation element (140).

Abstract: A diaphragm arrangement (100) for generating an oblique illumination in a microscope comprises a carrier element (130), an iris diaphragm element (110) having a variable iris diaphragm opening (111), a further diaphragm element (120) having a diaphragm opening (121) that, when it is in a first position relative to the carrier element (130), covers a portion of the iris diaphragm opening (111) and is mounted rotatably around a first rotation axis (A), such that a rotation of the further diaphragm element (120) around the first rotation axis (A) changes that portion of the iris diaphragm opening (111) which is covered by the further diaphragm element (120), and an actuation element (140) coupled to the further diaphragm element (120) via a coupling device (150) such that a rotation of the further diaphragm element (120) around the first rotation axis (A) is produced by an actuation of the actuation element (140).

Abstract: The invention describes a sleeve (1) for movably retained eyepiece tubes (2) for optical devices which rests with its eyepiece-side part (5) against the outer wall of the eyepiece tube (2), and with its housing-side part (6) fits around the inner wall of an opening (7) in the tube housing (3) provided for the eyepiece tube (2). The sleeve (1) is characterized an immovable fit on both device assemblies (2 and 3), and is securely protected against even unintentional removal. The result is to achieve a hermetic seal, impermeable to air and moisture, of the relevant parts of the optical device.

Abstract: The invention describes a sleeve (1) for movably retained eyepiece tubes (2) for optical devices which rests with its eyepiece-side part (5) against the outer wall of the eyepiece tube (2), and with its housing-side part (6) fits around the inner wall of an opening (7) in the tube housing (3) provided for the eyepiece tube (2). The sleeve (1) is characterized an immovable fit on both device assemblies (2 and 3), and is securely protected against even unintentional removal. The result is to achieve a hermetic seal, impermeable to air and moisture, of the relevant parts of the optical device.

Abstract: The invention relates to a tubular intermediary unit for a microscope comprising a relatively small upper part and a similarly small lower part, the upper part being pivotable about an axis of rotation relative to the lower part. Two deflecting mirrors are located in the observation beam path in the upper and lower parts. At least one of the deflecting mirrors can be pivoted, preferably about the same axis of rotation about which the upper part pivots, depending upon the tilt angle of the upper part relative to the lower part. The invention allows an observer to freely adjust an eyepiece tube carried by the upper part without changing the view on the field of vision under the microscope.