Stereomicroscope with a co-observer tube

1. A stereomicroscope comprising:

a binocular tube for a pair of main stereo beam paths;

at least one assistant's tube for at least one assistant's beam path, the assistant's tube being capable of swiveling about an axis of the at least one assistant's beam path in a plane parallel to the main stereo beam paths;

at least one optical beam splitter configured to divert the at least one assistant's beam path to the at least one assistant's tube via a back of a housing of the stereomicroscope; and

a counterweight configured to automatically swing in an opposite swiveling direction to a swiveling direction of the at least one assistant's tube.

2. The stereomicroscope as recited in claim 1 wherein the at least one optical beam splitter is capable of swiveling by 90°.

3. The stereomicroscope as recited in claim 1 wherein the at least one assistant's tube is detachably arranged on a port.

4. A stereomicroscope comprising:

a binocular tube for a pair of main stereo beam paths;

at least one assistant's tube for at least one assistant's beam path, the assistant's tube being capable of swiveling about an axis of the at least one assistant's beam path in a plane parallel to the main stereo beam paths;

at least one optical beam splitter configured to divert the at least one assistant's beam path to the at least one assistant's tube via a back of a housing of the stereomicroscope; and

a binocular tube disposed on the assistant's tube at an articulated joint so as to be swivelable by about 180° about a second axis of the at least one assistant's beam path and so as to be swivelable about an axis of the articulated joint, the axis of the articulated joint being perpendicular to the second axis of the at least one assistant's beam path.

5. The stereomicroscope as recited in claim 4 wherein the at least one optical beam splitter is capable of swiveling by 90°.

6. The stereomicroscope as recited in claim 4 wherein the at least one assistant's tube is detachably arranged on a port.

7. A stereomicroscope comprising:

a binocular tube for a pair of main stereo beam paths;

at least one assistant's tube for at least one assistant's beam path, the assistant's tube being capable of swiveling about an axis of the at least one assistant's beam path in a plane parallel to the main stereo beam paths;

at least one optical beam splitter configured to divert the at least one assistant's beam path to the at least one assistant's tube via a back of a housing of the stereomicroscope; and

a first and a second deflection element configured to connect the at least one assistant's beam path to a first port disposed on a middle portion of the housing.

8. The stereomicroscope as recited in claim 7 wherein the at least one assistant's beam path includes a first assistant's beam path from a first main stereo beam path and a second assistant's beam path from a second main stereo beam path, and further comprising a third deflection element selectably switchable between the first and second assistant's beam paths so as to direct a selected one of the first and second assistant's beam paths to the first port.

9. The stereomicroscope as recited in claim 8 wherein:

the at least one optical beam splitter is configured to selectably direct the first beam path to the first deflection element and a second port disposed on a side of the housing; and

the first deflection element is configured to selectably direct the first assistant's beam path to a third port disposed offset on the back of the housing and, with the third deflection element, the first port.

10. The stereomicroscope as recited in claim 8 wherein:

the at least one optical beam splitter is configured to selectably direct the second beam path to the second deflection element and a fourth port disposed on a side of the housing; and

the second deflection element is configured to selectably direct the second assistant's beam path to a fifth port disposed offset on the back of the housing and, with the third deflection element, the first port.

11. The stereomicroscope as recited in claim 8 wherein:

the at least one optical beam splitter includes a first and a second optical beam splitter each swivelable by at least 90°;

the third deflection element is swivelable by at least 90°; and

the first and second deflection elements are each swivelable by at least 45°.

12. The stereomicroscope as recited in claim 8 wherein:

the first deflection element is configured to selectably direct the first assistant's beam path to a third port disposed offset on the back of the housing and, with the third deflection element, the first port;

the second deflection element is configured to selectably direct the second assistant's beam path to a fifth port disposed offset on the back of the housing and, with the third deflection element, the first port; and

the at least one assistant's tube is configured to slide along a sliding rail between the first, third and fifth ports.

13. The stereomicroscope as recited in claim 8 wherein:

a first beam splitter of the at least one optical beam splitter is configured to selectably direct the first beam path to the first deflection element and a second port disposed on a side of the housing;

a second beam splitter of the at least one optical beam splitter is configured to selectably direct the second beam path to the second deflection element and a fourth port disposed on a side of the housing;

the first deflection element is configured to selectably direct the first assistant's beam path to a third port disposed offset on the back of the housing and, with the third deflection element, the first port;

the second deflection element is configured to selectably direct the second assistant's beam path to a fifth port disposed offset on the back of the housing and, with the third deflection element, the first port; and

the at least one assistant's tube is configured to slide along a semicircular sliding rail between the first, second, third, fourth and fifth ports.

14. The stereomicroscope as recited in claim 7 wherein the at least one optical beam splitter is capable of swiveling by 90°.

15. The stereomicroscope as recited in claim 7 wherein the at least one assistant's tube is detachably arranged on a port.