Abstract: The invention relates to an optical inspecting system designed to image an object to be inspected with a variable imaging scale, comprising a variation system for imaging the object into infinity, a lens group downstream of the variation system for imaging the object from infinity into the image plane of the whole system, and a light source for generating light in order to illuminate the object, means for imaging the illuminating light into the exit pupil of the variation system being provided in the airspace between the fifth lens group and the subsequent lens group. Of the five lens groups of the variation system, the first, second, and fourth lens groups, when seen in the imaging direction, are arranged in a movable manner in the direction of the optical axis, whereas the third and fifth lens groups are not movable.

Abstract: A wide range zoom system, for microscopes. The zoom system includes five lens groups, of which, starting at the object side, the second and fourth lens group are displaceable in the axial direction relative to the first, third and fifth lens group. A stop of variable opening diameter that is stationary relative to the first, third and fifth lens group is provided between the second and fourth lens group, wherein the maximum opening diameter of said stop is in middle zoom magnifications. As magnification increases, the object-side aperture increases non-linearly in relation to the magnification, such that in regions of low magnifications the object-side aperture increases more sharply than in regions of higher magnifications.

Abstract: The invention relates to an optical inspecting system designed to image an object to be inspected with a variable imaging scale, comprising a variation system for imaging the object into infinity, a lens group downstream of the variation system for imaging the object from infinity into the image plane of the whole system, and a light source for generating light in order to illuminate the object, means for imaging the illuminating light into the exit pupil of the variation system being provided in the airspace between the fifth lens group and the subsequent lens group. Of the five lens groups of the variation system, the first, second, and fourth lens groups, when seen in the imaging direction, are arranged in a movable manner in the direction of the optical axis, whereas the third and fifth lens groups are not movable.

Abstract: A wide range zoom system, for microscopes. The zoom system includes five lens groups, of which, starting at the object side, the second and fourth lens group are displaceable in the axial direction relative to the first, third and fifth lens group. A stop of variable opening diameter that is stationary relative to the first, third and fifth lens group is provided between the second and fourth lens group, wherein the maximum opening diameter of said stop is in middle zoom magnifications. As magnification increases, the object-side aperture increases non-linearly in relation to the magnification, such that in regions of low magnifications the object-side aperture increases more sharply than in regions of higher magnifications.

Abstract: An adjustable microscope tube for a microscope includes, in this order, along its beam path coming from an entrance to the microscope tube: an optical system, which images a first intermediate image to infinity; at least one deflecting element, which folds the parallel beam path following the optical system, and collecting optics, arranged following the deflecting element in the beam path, for imaging the first intermediate image, which has been imaged to infinity, onto a second intermediate image, wherein the length of at least one portion of the folded, parallel beam path can be changed by displacement of the deflecting element relative to the optical system.

Abstract: The invention is directed to an immersion microscope objective. This microscope objective contains four lens groups. The first lens group has a focal length of 2.6f–3.1f, where f is the total focal length of the microscope objective. The first lens group contains two lens components with a collecting effect. The first lens component has a focal length of 3f–4.5f. One of the lenses in the first lens component is made from a material with n greater than 1.72. A lens of the second lens component is made from a material with a partial dispersion of a first type. The second lens group with a focal length of 8f–10.2f comprises at least two lenses which are cemented together. A collecting lens is made from a material with a partial dispersion of the first type, and a diverging lens is made from a material with a partial dispersion of a second type. There follows a third lens group with a focal length greater than |25f|.

Abstract: An adjustable microscope tube (MT) for a microscope (T) comprises, in this order, along its beam path coming from an entrance to the microscope tube (MT): an optical system (S), which images a first intermediate image to infinity; at least one deflecting element (U1, U2), which folds the parallel beam path following the optical system (S), and collecting optics (SO), arranged following the deflecting element (U1, U2) in the beam path, for imaging the first intermediate image, which has been imaged to infinity, onto a second intermediate image, wherein the length of at least one portion (A1, A2) of the folded, parallel beam path can be changed by displacement of the deflecting element (U1, U2) relative to the optical system (S).

Abstract: The invention is directed to an immersion microscope objective. This microscope objective contains four lens groups. The first lens group has a focal length of 2.6f-3.1f, where f is the total focal length of the microscope objective. The first lens group contains two lens components with a collecting effect. The first lens component has a focal length of 3f-4.5f. One of the lenses in the first lens component is made from a material with n greater than 1.72. A lens of the second lens component is made from a material with a partial dispersion of a first type. The second lens group with a focal length of 8f-10.2f comprises at least two lenses which are cemented together. A collecting lens is made from a material with a partial dispersion of the first type, and a diverging lens is made from a material with a partial dispersion of a second type. There follows a third lens group with a focal length greater than |25f|.