What is Objective Lens in Rangefinder – Full Overview

Do you want to know what the objective lens in the rangefinder is?

Let’s find out.

What Is Objective Lens in Rangefinder?

The objective diameter is basically the width of the viewing area created by the exit pupil on your rangefinder.

Most rangefinders fall between 20 and 25 millimeters. Most binoculars have objective lenses between 40 and 50 millimeters, and spotting scop­es usually measure between 50 and 100 millimeters.

How Do Rangefinders Work?

Most rangefinder cameras usually have three different types of lens

  • the objective lens
  • the light-receiving lens
  • the eyepiece lens

Objective Lens

The objective lens is an optical element placed at the front of the telescope that collects incoming rays of sunlight and focuses them into an enlarged view of the sky. A large objective lens allows for greater magnification, which creates a brighter picture.

Light-Receiving Lens

The lens that receives the returned infrared radiation is called the receiver lens. It provides information about the distance to the object by measuring the time it takes for the reflected signal to reach the receiver.

Eyepiece Lens

The eyepiece is the last part of the rangefinder you use to measure the distances between yourself and your targets.

Golf VS Hunting VS Shop Hunting Rangefinders

Some hunters who both shoot and hunt wonder whether they can use the same rifle scope for both activities.

It’s important to know which rangefinder has the right features for your application.

Golf Rangefinders

Golf Rangefinders measure distances by measuring the time it takes for an object to reach its location.

Because the flag on a golf course is usually the closest thing in your line of sight, and you don’t always know where the flag is located, they base their measurements on that.

Additionally, some golf rangefinder devices have specific functions designed for golfing, including helping you select clubs or determining the slope of the terrain.

Hunting Rangefinders

Hunting Rangefinders prioritize distant targets (like deer) over nearer ones (like trees). Because most people hunt game animals in open spaces, they usually want their rangefinders to ignore anything that gets in the way of the animal.

Some hunting ranges finders even estimate your bullet drop based on the type of ammunition you’re using.

Shop Hunting Rangefinders

If you’re looking for a rangefinder that works well for both golf and hunting, make sure that it has the capability to switch between near and far modes.

And if you don’t need any of the convenience features offered by a dedicated rangefinder, then choose one that offers just that.

You’re better off buying a rangefinder that suits your specific needs rather than one that tries to be everything for everyone.

what is objective lens in rangefinder

What is Objective Lens in Rangefinder?

How to Choose a Rangefinder?

Whether you’re playing golf, hunting, or shooting at targets, you must be able to determine the distance between you and them. A good rangefinder is essential for accuracy.

Rangefinder Features

Before buying rangefinders for golfing or hunting it’s important to consider its most important features.

  • max distance
  • magnification
  • size
  • modes

This will allow you to narrow down your choices and choose the best rangefinder for your needs.

Max Distance

When choosing a rangefinder, consider its maximum measurement range. You’ll need one with a longer range so you don’t have to be too close to your target to get an accurate reading.

Laser rangefinder devices have two maximum distances they can measure.

  • One for reflective targets like some flags or specialized targets
  • One for non-reflective objects like deer.

Because laser rangefinders rely on the reflected light from objects, the reflective range will usually be greater than the non-reflecting range.

When deciding which camera to buy, consider when you’ll be using the rangefinder the most often.

If you’re going to be using your rangefinders mainly for hunting small game (deers) at distances of up to 400 meters, then a range finder with a non-reflecting range of 600 to 800 meters would work best.

Choose a rangefinding device with a maximum range higher then the longest hole you plan on playing on.


Magnification indicates how zoom-in an object appears when viewed through the lens. A magnification of 6x means that the object will appear six times bigger than it would if viewed with the naked eye.

When using a rangefinder, magnify faraway objects so that you can place the reticle precisely on your intended targets, which gives you the most accurate distance info.

A higher magnification lens also produces a darker image and has less of a field of view.

Most people prefer rangefinders with a magnification factor of six (6X). They allow them to get an accurate measurement of their targets without sacrificing too much clarity.


One of the most important factors when choosing rangefinders is comfort. Make sure the rangefinder feels comfortable in your hand and has controls that are easily accessible.

A smaller rangefinder may not feel comfortable for some people because they’re too big. However, if you want something that feels good in your hand, then you need to consider its overall dimensions.


Some modern rangefinders provide a number of different measurement methods. These additional measurements can help you get better results when shooting.

Scan Mode

When using the rangefinder in Scan Mode, the rangefinder will continuously calculate the distances between you and your targets as long as you keep the shutter button pressed down.

This is most useful for measuring distances from a fast-paced subject, especially at longer ranges (e.g., 100 meters).

Angle Compensation Mode

Slope Compensated Mode allows you to get the exact range to your target, but also considers the incline or decline of your path.

If you’re playing a tournament where angle compensation isn’t allowed, turning this feature off may be helpful.

Rain or Fog Mode

Rain or fog mode prevents rain from affecting the rangefinder’s readings. Since raindrops can refractor the laser beam, the rangefinder’s readings may be slightly off when it rains.

Rain mode overrides the refraction, giving you accurate readings regardless of the weather.


A rangefinder allows you to see through the lens without obstructions. This makes it easier to frame your shots.

We hope now you have full knowledge of rangefinders.

Feel free to ask any more questions in the comments below.

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