Telescope rangefinders generally use the pulse method to measure distances. The process of pulse method ranging is as follows: the laser emitted by the range finder is reflected by the object to be measured and then received by the range finder, and the range finder records the time of the laser round trip at the same time. Half the product of the speed of light and the round-trip time is the distance between the rangefinder and the object being measured. The accuracy of the distance measurement by the pulse method is generally about +/- 1 meter. In addition, the measurement blind area of this type of rangefinder is generally about 15 meters.
