NIGHT VISION RIFLE SCOPES

Choosing a night vision scope

How digital night vision works

Digital night vision uses a sensor that responds to visible and near-infrared light. It builds an image from the light that's available, such as moonlight, starlight or ambient light. Some systems can also use infrared illumination when there isn't enough natural light. Digital night vision scopes generally show the image on an internal display rather than letting you view the scene directly through glass, so check the specification of the exact model you're considering. This guide doesn't cover other night vision technologies.

The image depends on light, so the quality you get depends on the conditions on the night, the sensor and any illumination used. Display modes also differ between models. Some offer colour viewing in daylight, and night images are often shown in monochrome or a selectable palette. Check the modes listed for the model you're considering, because they aren't the same on every scope.

Dedicated scope, add-on or thermal?

Night-viewing equipment comes in several forms, and each one suits a different need:

• Dedicated night vision scopes, the products on this page, are complete sighting optics with night viewing built in. They're designed to be used as a single unit rather than alongside a separate day scope. Check the exact model's specification for its reticle, display and controls.
• Night vision add-ons work with a separate, compatible day scope. They suit buyers who want to keep an existing optic, but compatibility depends on both the add-on and the host scope.
• Thermal rifle scopes detect longer-wavelength infrared. They don't rely on the reflected visible and near-infrared light that digital night vision uses. The image mainly shows heat contrast, although reflected infrared, surface properties and atmospheric conditions can also affect it. Thermal works differently from night vision and suits different priorities.

Some buyers also choose to use a separate handheld device for observation. That's a separate purchase, and a handheld device isn't part of a scope listing unless the product page says so. Whether it's worth having depends on how you plan to use your equipment.

Infrared illumination: possible arrangements

Infrared illumination can be supplied in different ways, depending on the device and the bundle:

• It may be built into the scope.
• It may be supplied as a detachable unit.
• It may be an optional accessory bought separately.

The same product family can also be offered in more than one configuration. Read the product description to see exactly what's supplied with the version you're looking at. If you'd need to add an illuminator, check that it's suitable for that specific scope. Where a model lists an illumination wavelength, compare that as well.

What to compare between models

Once you've narrowed your shortlist, these are the points that separate one scope from another:

• Magnification range: compare the lowest and highest settings against the distances you expect to view at.
• Display and sensor: check the listed resolution and the available viewing modes.
• Power: check the battery type, whether batteries are removable or built in, and any runtime the manufacturer states for that model.
• Size and weight: a dedicated digital scope can be larger than a conventional day scope, which affects the overall balance of your setup.
• Laser rangefinder: "LRF" in a product name usually indicates a laser rangefinder. Confirm the feature in the model's specification. If a name doesn't mention LRF, don't assume the model lacks one.
• Mounting: check which mounting interface the scope uses and whether rings or a mount are included.
• What's in the box: check for illuminators, batteries, chargers, mounts and any other accessories.

Frequently asked questions

How does night vision differ from thermal imaging?

Digital night vision forms an image from visible and near-infrared light. That light is either already in the scene or added by an infrared illuminator. Thermal imaging detects longer-wavelength infrared instead. The signal reaching the sensor can include radiation emitted by objects and radiation reflected from their surroundings. How much each contributes depends on the surfaces in the scene and the conditions. The air between you and the scene also affects what reaches the sensor.

In practice, night vision shows detail in a way closer to a conventional image, while thermal shows heat contrast. Neither performs the same way in every condition, and not all thermal devices show temperature readings. If you're unsure which suits you, think about whether you most need recognisable detail or heat contrast. Then compare specific models within that technology.

Does a night vision scope need an IR illuminator?

It depends on the model and the conditions. In very low light, digital night vision often relies on infrared illumination to produce a usable image. Even with illumination, results still vary with the conditions and the equipment.

If you expect to use the scope in very dark conditions, include illumination in your budget from the start. Check the exact listing to see whether an illuminator is built in, supplied or not included. If you'd need to add one, confirm that the illuminator you're considering is suitable for that specific scope. Don't assume that any illuminator will work with any scope.

Can a night vision scope be used in daylight?

Many digital models are designed for both day and night use, which is why they're often described as "day and night" scopes. This isn't true of every type of night vision technology. Check the product page and the manufacturer's guidance for the specific model.

How is a dedicated night vision scope different from an add-on?

A dedicated scope is a complete sighting optic with night viewing built in, so it works without another scope. An add-on is used together with a separate day scope. An add-on lets you keep an optic you already own, but it must be compatible with that host scope. A dedicated scope avoids that compatibility question but replaces your day optic on that setup.

If you're considering an add-on, confirm compatibility with your exact scope model before you buy.

What should I compare before choosing a night vision scope?

Work through your decision in this order:

1. Settle the format. Decide between a dedicated scope, an add-on and thermal before comparing individual models.
2. Rule models in or out on the essentials. These are the things you can't change after buying, such as the magnification range and the display.
3. Compare the complete package. Look at the exact version and bundle. Check whether it includes the illumination, batteries and mount you'd otherwise buy separately.

Here's the main trade-off. A model with more built-in features isn't automatically the better buy if you won't use those features. Equally, a lower-priced version can cost more once you add the accessories it doesn't include. Similar product names can hide different configurations, so compare the specific listings rather than the product family. If after-sales support matters to you, ask about the specific product before you buy.

What does "LRF" mean in a scope's name?

LRF usually stands for laser rangefinder, a function that measures the distance to a target. Treat the product name as a pointer, not a complete feature list. Confirm the rangefinder in the model's specification, and don't assume a model lacks one because "LRF" isn't in its name.

Where a rangefinder is listed, check the stated measuring range and any conditions attached to it. Measurement depends on factors such as the target, its surface and the conditions. Some manufacturers quote different maximum ranges for different types of target. No rangefinder can guarantee a reading on every target at every distance. If ranging matters to you, compare the specifications rather than the headline figure.