The role of the shading ring on the shading device
The shading ring on the shading device can be large or small. Rotating the shading device can adjust the light intensity. The large iris can transmit more light to make the field of view bright, and the small iris can transmit less light and darken the field of view; rotate the collimator screw to adjust the lens barrel Lifting.
The main function of the light-shielding ring
1: In the microscope structure, the adjustment of the lens barrel up and down is the coarse focusing screw, not the shutter, so this option does not meet the meaning of the question;
2: During the use of the microscope, the image can be made clearer by adjusting the fine focus screw, so this option does not meet the meaning of the question;
3: In the use of the microscope, the light can be reflected into the light-passing hole by adjusting the reverse mirror. If the light is weak, use a concave mirror, when the light is strong, use a flat mirror, so this option does not meet the meaning of the question;
4: In the microscope structure, the light intensity can be adjusted by adjusting the aperture size of the shutter; when aiming the light, turn the shutter so that the larger aperture is aligned with the light hole. If the aperture is smaller, the field of view will be dark. Therefore, this option meets the meaning of the question;