Abstract: An optical element comprises a planoconvex basic shape along an optical axis of the optical element; a third portion arranged between a first portion and a second portion. The first portion includes a plane side face for facing an object to be imaged. The second portion includes a convexly shaped side face for facing an image plane. The plane side face of the first portion is designed to collect and steer a radiation to be captured into the optical element, the optical element being designed to guide rays of the captured radiation in a beam path. The first, the second and the third portions are arranged directly adjacent to one another. A refractive index of the third portion is greater than a refractive index of the second portion, and the refractive index of the second portion is greater than a refractive index of the first portion.

Abstract: A tube system for a microscope includes two lenses and a glass element. The tube system can have a compact build and chromatic aberrations that lie within a specified range.

Abstract: A tube system for a microscope includes two lenses and a glass element. The tube system can have a compact build and chromatic aberrations that lie within a specified range.

Abstract: The invention relates to a zoom objective lens with continuously adjustable magnification, comprising five lens groups, where the first lens group, the second lens group and the fifth lens group are fixed in relation to an object. The third lens group and the fourth lens group are axially displaceable. The following conditions apply to the lens: the variable air gap between the second lens group and the third lens group decreases or has a turning point with a transition from a low to a high magnification ?, the refractive power of the second, third and fifth lens groups is positive and the refractive power of the fourth lens group is negative.

Abstract: A system for microscopic applications, including a rotating structural element that acts as a beam splitter and has reflecting and transmitting structures, and which is disposed in an intermediate image plane of the beam path conjugated with the object field, and by which the structure is imaged onto an object in the object plane. The fluorescent light reflected by the object, or caused by the illumination, strikes the structural element as well as an image processing module. The beam reflected and transmitted by the structural element is guided through the image processing module. The structural element is set at an angle to the vertical of the beam path. An optical adapter, which tilts the microscopic intermediate image onto the plane of the structural element acting as beam splitter, is disposed at the interface between the microscope and the image processing module.

Abstract: The invention relates to a zoom objective lens with continuously adjustable magnification, comprising five lens groups, where the first lens group, the second lens group and the fifth lens group are fixed in relation to an object. The third lens group and the fourth lens group are axially displaceable. The following conditions apply to the lens: the variable air gap between the second lens group and the third lens group decreases or has a turning point with a transition from a low to a high magnification ?, the refractive power of the second, third and fifth lens groups is positive and the refractive power of the fourth lens group is negative.

Abstract: An immersion objective for a light microscope with a first lens group including a first and second lenses, with a third lens arranged behind the first lens group, a first air gap between the first lens group and the third lens, with a second lens group behind the third lens and including fourth, fifth and sixth lenses, a second air gap formed the third lens and the second lens group, and a third lens group behind the second lens group including seventh, eighth and ninth lenses. Tenth, eleventh and twelfth lens are provided behind the third lens group. For correction of aberrations a fourth air gap is formed between the third lens group and the tenth lens, a fifth air gap is formed between the tenth lens and the eleventh lens and a sixth air gap is formed between the eleventh lens and the twelfth lens.

Abstract: A tube lens unit for microscopes with achromatically corrective effect for the use with objectives that image an object to infinity and that have achromatic residual errors. The tube lens unit includes of at least two lenses with the properties: nP<1.50 and vP<71 nN<1.66 and vN<37, wherein nP and nN signify the refractive index (ne) at a wavelength of 546 nm for a positive and negative lens respectively, and vP and vN signify the Abbe number (ve) at a wavelength of 546 nm for a positive and negative lens respectively, and the beam paths are characterized by the conditions: |?A|<0.60 and |?B|<0.30, wherein ?A signifies the variation of the aperture ray and ?B signifies the variation of the main ray while passing through the surfaces of the lenses.

Abstract: A system for microscopic applications, including a rotating structural element that acts as a beam splitter and has reflecting and transmitting structures, and which is disposed in an intermediate image plane of the beam path conjugated with the object field, and by which the structure is imaged onto an object in the object plane. The fluorescent light reflected by the object, or caused by the illumination, strikes the structural element as well as an image processing module. The beam reflected and transmitted by the structural element is guided through the image processing module. The structural element is set at an angle to the vertical of the beam path. An optical adapter, which tilts the microscopic intermediate image onto the plane of the structural element acting as beam splitter, is disposed at the interface between the microscope and the image processing module.

Abstract: A tube lens unit for microscopes with achromatically corrective effect for the use with objectives with infinite image distance and achromatic residual errors. The tube lens unit includes of at least two lenses with the properties: nP<1.50 and vP<71 nN<1.66 and vN<37, wherein nP and nN signify the refractive index (ne) at a wavelength of 546 nm for a positive and negative lens each, and vP and vN signify the Abbe number (ve) at a wavelength of 546 nm for a positive and negative lens each, and the beam paths are characterized by the conditions: |?A|<0.60 and |?B|<0.30, wherein ?A signifies the variation of the aperture beam and ?B signifies the variation of the main beam while passing through the surfaces of the lenses.

Abstract: An immersion objective for a light microscope with a first lens group including a first and second lenses, with a third lens arranged behind the first lens group, a first air gap between the first lens group and the third lens, with a second lens group behind the third lens and including fourth, fifth and sixth lenses, a second air gap formed the third lens and the second lens group, and a third lens group behind the second lens group including seventh, eighth and ninth lenses. Tenth, eleventh and twelfth lens are provided behind the third lens group. For correction of aberrations a fourth air gap is formed between the third lens group and the tenth lens, a fifth air gap is formed between the tenth lens and the eleventh lens and a sixth air gap is formed between the eleventh lens and the twelfth lens.

Abstract: The invention relates to a microscope objective with preferably anti-symmetric lenses or lens groups with an optical magnification of ?100 and a visual field factor of 20. According to the invention the microscope objective consists of 9 lenses with 3 cemented elements, starting from the object side (left), a lens which is almost a hemisphere L1 with positive refractive power, a meniscus lens L2 with positive refractive power, a two-part cemented element G1 with positive refractive power, another two-art cemented element G2 with positive refractive power, a two-part cemented element G3 with negative refractive power, and finally a meniscus lens L9 with negative refractive power. By using cemented elements and lens pairings of the same construction, production costs can be reduced compared with methods of the prior art while image contrast is improved.

Abstract: An immersion microscope objective includes a system of several optical lenses or lens groups between which air spaces are provided and an adjusting device for adapting the immersion microscope objective to different immersion mediums for correcting imaging errors when utilizing the immersion microscope objective in connection with a cover glass, which closes off a specimen holder, and/or for correcting longitudinal chromatic aberrations. The adjusting device is configured to change two air spaces and especially the air spaces (A1, A2) are linearly changeable.

Abstract: A microscope objective having at least four lenses or groups of lenses and which can be used to improve image contrast. According to the invention, a phase plate, aligned concentrically to the optical axis, can be integrated into and taken out of the air space between the first lens and the second lens, as viewed from the object side. The defined arrangement of the phase plate and the associated shift of the real pupil into the air space between the first two lenses or groups of lenses, respectively, of the microscope objective allows a microscope objective, initially designed as a bright-field variant, to be redesigned as a phase contrast variant with relative ease.

Abstract: The invention is directed to an objective, particularly for telescope-type stereomicroscopes. The objective comprises two lens groups, a first lens group and a second lens group. The first lens group, which faces the object plane, has a positive refractive power and comprises a plurality of lenses of which at least two form a cemented component. The second lens group, which is on the image side, has a negative refractive power and comprises a collecting cemented component and a diverging lens. The objective is characterized in that the following conditions B1 and B2 are met: where DAP represents the diameter of the exit pupil of the objective and ?1 represents the maximum field angle.

Abstract: The invention relates to a microscope objective with preferably anti-symmetric lenses or lens groups with an optical magnification of ?100 and a visual field factor of 20. According to the invention the microscope objective consists of 9 lenses with 3 cemented elements, starting from the object side (left), a lens which is almost a hemisphere L1 with positive refractive power, a meniscus lens L2 with positive refractive power, a two-part cemented element G1 with positive refractive power, another two-art cemented element G2 with positive refractive power, a two-part cemented element G3 with negative refractive power, and finally a meniscus lens L9 with negative refractive power. By using cemented elements and lens pairings of the same construction, production costs can be reduced compared with methods of the prior art while image contrast is improved.

Abstract: The invention is directed to an objective, particularly for telescope-type stereomicroscopes. The objective comprises two lens groups, a first lens group and a second lens group. The first lens group, which faces the object plane, has a positive refractive power and comprises a plurality of lenses of which at least two form a cemented component. The second lens group, which is on the image side, has a negative refractive power and comprises a collecting cemented component and a diverging lens. The objective is characterized in that the following conditions B1 and B2 are met: 46.5<DAP?60 and??B1 0.16?tan ?1,??B2 where DAP represents the diameter of the exit pupil of the objective and ?1 represents the maximum field angle.

Abstract: The invention relates to a microscope objective which consists of at least four lenses or groups of lenses and can preferably be used to improve image contrast. According to the invention, a phase plate, aligned concentrically to the optical axis, can be integrated into and taken out of the air space between the first lens and the second lens, as viewed from the object side. The defined arrangement of the phase plate and the associated shift of the real pupil into the air space between the first two lenses or groups of lenses, respectively, of the microscope objective allows a microscope objective, initially designed as a bright-field variant, to be redesigned as a phase contrast variant with relative ease.

Abstract: An immersion microscope objective includes a system of several optical lenses or lens groups between which air spaces are provided and an adjusting device for adapting the immersion microscope objective to different immersion mediums for correcting imaging errors when utilizing the immersion microscope objective in connection with a cover glass, which closes off a specimen holder, and/or for correcting longitudinal chromatic aberrations. The adjusting device is configured to change two air spaces and especially the air spaces (A1, A2) are linearly changeable.

Abstract: The invention is directed to an immersion microscope objective. An objective of this kind has an adjusting element, for example, a correction ring, by which it can be adjusted to different immersion media. In an advantageous manner, the objective can also be adjusted to different temperatures of the solutions and different coverslip thicknesses of object vessels by the correction ring.