How Does an Optical Rangefinder Work? – In-Depth Guide with Tips, Tricks, FAQs, & More

Optical rangefinders are fun to use.

But how do they work?

Let’s find out!

How Do Optical Rangefinders Work?

Optical rangefinders are very cheap but give less accurate results than the other two options. Golf courses often use them because they’re cheaper than the other options.


Optical rangefinders use a scale to measure distances. A pin is placed in an eyepiece, and the height of the pin is measured. Then, the pin is removed, and the user looks into the eyepiece to see how far away something is.

Note: If you want to know tutorials about rangefinder click HERE.


Rangefinder cameras use the principle of parallax, which is a method of determining distance based on the relative position of objects viewed through two different lenses. The focusing knob adjusts the distance between the two lenses.


Focusing is very important when using a rangefinder. You need to be careful about focusing your instruments.

Accurate results depend on how precisely you focus them.

Note: If you want to know How to Wire Rangefinder CJMCU981 to APM26 click HERE.

How Does an Optical Rangefinder Work?

How Does an Optical Rangefinder Work?


Optical rangefinders are cheap, accurate, and easy to use. They do not need batteries, and there is no danger of measuring to the wrong object.


Golf pins are used to measure distance. Accuracy is generally around 90% but decreases as distance increases.

Note: If you want to know How to Use the X40 Rangefinder click HERE.

Basic Functions

Optical rangefinders use the range-to-frequency principle to convert the height of the pin into the distance. Their primary function is to determine the range of a target.

These instruments enable users to locate objects by revising the parallax coming about because of review from two separate focuses. The smaller the edges created, the greater is the separation and vice versa.

Who Should Use an Optical Unit?

This rangefinder is cheap, but it is also very effective. It is the cheapest among all others because it doesn’t require batteries or any other power source. It is easy to use and you can get it anywhere.


Golf pins are used to hold things steady. They are accurate enough to help you play golf but not precise enough to measure distances accurately.

A rangefinder is an instrument used to measure distance by projecting light onto a target object and measuring the time required for the reflected light to return to the device.

This technique was first developed during World War II as a means of determining the range of artillery fire. Rangefinders were later adapted for use in surveying, navigation, and photography.

Note: If you want to know How to Use Tour S Laser Rangefinder click HERE.


Optical range finders are very useful tools that help people locate objects or people.

These devices are used by hunters, hikers, and soldiers to find out how far away something is.

If you want to gain more information about rangefinder click HERE.


  • John Moses

    John is the Editor in Chief here at The Outdoor Stores. His area of expertise ensures that there is no one better to suggest which rifles are most suitable for your hunting experience. He is also available for you to contact him personally to discuss the types of animals you want to hunt and the terrain you will be hunting on. Feel free to read his posts for expert opinion on Rifles, Scopes, Rangefinders, Bonoculars and Monoculars.

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