The optical system of the microscope consists of the eyepiece together with the objective and various accessories. These elements must have compatible characteristics.

The 20x magnification SE20 objective is designed for a microscope with a 30 mm diameter eyepiece tube. The device cannot be adjusted to the user's vision - so if diopter adjustment is required, it should be done directly on the microscope using the diopter adjustment ring on the eyepiece tube (if available).

Specifications
- Lens material: optical glass
- Degree of magnification, multiplier: 20
- Field of view diameter, mm: 12
- Diopter adjustment: −
- Division, mm: 0.1
- Eyepiece diameter, mm: 30
- Frame material: copper
- Eye distance, mm: 10

Compatibility
- MAGUS Stereo 9T stereomicroscope