The way to eliminate parallax is () to make the reticle and the target image clear.

The way to eliminate parallax is () to make the reticle and the target image clear. ?

A. rotate the aiming screw of the objective lens; ?

B, rotate the eyepiece aiming screw; ?

C, repeatedly and alternately adjusting the aiming screws of the eyepiece and the objective lens;

D. adjust the inching screw.

Analyze C.

collimating error

It is the direction difference produced by observing the same target from two points with a certain distance. Seen from the target, the included angle between two points is called the parallax angle of these two points, and the connecting line between the two points is called the baseline. As long as the parallax angle and baseline length are known, the distance between the target and the observer can be calculated.

Parallax refers to the difference between the observation window in the camera and the scene frame shot by the lens.

The observer looks at the direction difference of the same object in two different positions. For example, when you put a finger in front of your eyes, close your right eye first and look with your left eye; Close your left eye and look at it with your right eye, and you will find that the position of your finger relative to distant objects has changed, which is the parallax of the same point from different angles.

Parallax can be expressed by the opening angle of the distance (baseline) between two different positions of the observer on the celestial body.

Because there is a distance between people's left and right eyes, there will be a slight difference in the perspective of the two eyes, and such a difference will make the scenery observed by the two eyes have a little displacement.

The reason why human beings can produce stereoscopic vision with a sense of space is precisely the organic synthesis of this displacement called parallax in the brain. Don't forget: if there is no 6CM distance between your eyes, you will never enjoy 3D!