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Optical sight simple distance measurement
Aug 03, 2018

Parabolic shooting, ranging is the first step.

Don't underestimate the light sight, it can not only help you aim, but also help you to measure the distance, which is beyond the sight of the machine.

Take the 4 times fixed light sight at hand as an example, the angle of view is 6 degrees, that is, the center is opposite, and each side is 3 degrees.

It is known from the trigonometric function that the ratio of the adjacent side to the opposite side is CTG(x), CTG(3) is 19, and the accuracy is not equal to 20. That is, your distance to the target is 20 times the width of the field of view in your mirror.

For example, if you aim at a 5 meter object with a 4x light sight somewhere, such as a car, the width of the car in the mirror is close to the radius of the field of view, then the distance to the car is about 5x20=100 meters.

Similarly, if you see a prey that is about 1 meter long, for example, the width of the mirror is close to the radius of the field of view, then the intensity of your prey is about 1X20 = 20 meters.

You can see more information in the light sights with more divisions. For example, the total length of the dotted line on one side of the cross center is 1/4 of the radius, and the small grid in the dotted line is 1/16 of the radius; The scale of each scale is about 1/10 of the radius, and the width of the horizontal line of the top of the gradient is 1/2 of the radius.

This gives a set of ratios of width to distance.

Field of view radius: distance = 1:20

Top gradient single side width: distance? = 1:40

Cross center dotted line radius: distance = 1:80

Dotted grid: distance = 1:320

Gradient scale height: distance = 1:200

The above data is my own light sight measurement, each person is different, the data is different.

Keep in mind the average body size data such as rabbits, pheasants, several sons, shit, wild ducks, pigeons, sparrows, etc., in the mirror, the ratio can be roughly proportional.

If the prey has a certain angle with the aiming direction, estimate it as 45 degrees, multiply by the inclination factor of 0.7 and multiply by the distance ratio.

The above method is the same as the military telescope's ranging principle, and the accuracy is not too high, but it should be a bit more accurate than experience.

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