A thermal clip-on attachment is a thermal imaging device designed to work alongside a compatible conventional rifle scope. It detects infrared radiation emitted by objects and converts the information into a thermal image.

Unlike digital night vision, thermal imaging does not rely on visible light or an infrared illuminator. This makes it useful for detecting heat signatures in darkness and difficult lighting conditions.

Front-mounted thermal attachments are generally positioned ahead of the daytime scope using a suitable mounting system. Compatibility with the scope, adapter and intended magnification range must be checked before use.

Both systems provide thermal imaging, but they offer different approaches to rifle-mounted optics.

Thermal Clip-On Attachments

• Designed to work with compatible existing daytime scopes.
• Can reduce the need to replace a familiar optical setup.
• Some models offer multiple operating configurations.
• Require suitable mounting hardware and compatibility checks.
• Performance can depend on the magnification of the daytime scope.

Dedicated Thermal Rifle Scopes

• Operate as complete thermal sighting systems.
• Use their own displays, controls and digital reticles.
• Do not require a separate daytime rifle scope.
• May offer integrated ballistic calculation and rangefinding.

For a complete thermal sighting solution, explore our Thermal Rifle Scopes collection.

Thermal sensor resolution is one of the most important specifications when comparing thermal clip-on attachments. It determines how much thermal information the sensor can capture.

• 256 × 192: Entry-level thermal resolution, generally suited to more basic detection requirements.
• 384 × 288: A common mid-range resolution offering a useful balance of detail and cost.
• 640 × 512: Higher-resolution imaging capable of displaying finer thermal detail.

Higher resolution can improve image detail, particularly when viewing smaller or more distant heat signatures. However, lens quality, sensor sensitivity, processing and environmental conditions also affect performance.

NETD stands for Noise Equivalent Temperature Difference. It describes how effectively a thermal sensor can distinguish small temperature differences.

NETD is normally measured in millikelvin (mK). A lower NETD value generally indicates greater thermal sensitivity, although overall image quality also depends on processing and optical performance.

Good thermal sensitivity can be particularly useful during damp, misty or low-contrast conditions when the temperature difference between an animal and its surroundings is reduced.

Thermal clip-on attachments are available with different objective lens sizes, including 35mm, 50mm and larger configurations.

Lens size, sensor resolution and pixel pitch influence field of view and detection performance.

• Smaller lens configurations can provide a wider field of view for scanning closer areas.
• Larger lens configurations can offer greater detection capability at longer distances.
• Higher-resolution sensors can provide improved image detail and more flexibility.

Manufacturer detection distances are normally based on defined test conditions and should not be confused with reliable target identification or ethical shooting distances.

Correct mounting is essential for the safe and effective operation of a thermal clip-on attachment. Most front-mounted systems require a compatible adapter or mounting interface.

Before purchasing, check:

• The external objective diameter of the daytime scope.
• The mounting interface required by the thermal attachment.
• Clearance between the rifle, scope and attachment.
• The recommended daytime scope magnification range.
• Whether a mounting adapter is included or sold separately.
• Any manufacturer requirements for alignment and calibration.

Compatibility varies between models. Always consult the manufacturer's instructions and confirm that the chosen mounting system is suitable for your equipment before installation.

The NocPix MATE range includes thermal imaging attachments designed for use with compatible daytime optical systems.

Models in our collection include:

• NocPix MATE LITE Thermal Imaging Clip-On.
• NocPix MATE H38R with Laser Rangefinder.
• NocPix MATE H50R with Laser Rangefinder.
• NocPix MATE ULTRA S60R with Laser Rangefinder.

The range offers different sensor, lens and rangefinding configurations to suit varying performance requirements and budgets.

Compare individual specifications carefully, including sensor resolution, thermal sensitivity, battery arrangements and mounting requirements.

Explore more products in the complete NocPix range.

The HIKMICRO Thunder 3.0 series provides a range of thermal imaging clip-on attachments designed for compatible daytime optics.

Models in this collection include:

• HIKMICRO Thunder TH35C 3.0 – 35mm, 384px sensor.
• HIKMICRO Thunder TQ35CL 3.0 – 35mm, 640px sensor with LRF.
• HIKMICRO Thunder TQ50C 3.0 – 50mm, 640px sensor.
• HIKMICRO Thunder TQ50CL 3.0 – 50mm, 640px sensor with LRF.

These models offer different combinations of thermal resolution, lens size and integrated rangefinding capability.

The Thunder range is worth comparing for customers who want thermal capability while retaining compatible existing daytime optics.

Discover further thermal imaging products in the HIKMICRO collection.

Selected thermal clip-on attachments feature an integrated laser rangefinder, commonly abbreviated to LRF.

An LRF measures the distance to a target, providing additional information that can be useful when assessing range.

Rangefinding capability can be particularly useful in darkness when judging distances visually is more difficult.

Models such as the NocPix MATE H38R, MATE H50R, MATE ULTRA S60R and selected HIKMICRO Thunder CL variants offer integrated rangefinding.

Always check the individual model's rangefinding specifications, measurement limits and operating features.

Thermal clip-on attachments vary considerably in price depending on sensor resolution, lens size, thermal sensitivity, rangefinding capability and other features.

Entry-Level Thermal Attachments

Lower-cost models can be suitable for customers prioritising basic thermal detection and compatibility with existing equipment.

Mid-Range Thermal Clip-Ons

Mid-range models may offer improved resolution, thermal sensitivity or additional features, providing a balance between performance and cost.

Premium Thermal Clip-On Attachments

Higher-end models can provide high-resolution sensors, larger objective lenses and integrated laser rangefinders.

The most suitable attachment is not necessarily the most expensive. Consider typical viewing distances, field of view, compatibility and the conditions in which it will be used.

Battery performance is an important consideration when choosing a thermal clip-on for extended outdoor use.

Different attachments may use removable rechargeable batteries, integrated power systems or compatible external power sources.

Battery life depends on the model, operating temperature, display settings, recording functions and other active features.

Cold conditions can reduce battery performance, so carrying a compatible spare battery can be useful where supported.

Check each product listing for battery type, expected operating time, charging options and included accessories.

Thermal imaging and digital night vision use different technologies.

Thermal Imaging

Thermal devices detect temperature differences and produce images based on heat signatures. They do not require an infrared illuminator to detect thermal contrast.

Digital Night Vision

Digital night vision uses an imaging sensor to capture available light. In very dark conditions, an infrared illuminator may be required for effective viewing.

Thermal imaging is particularly useful for detecting heat signatures, while digital night vision can provide more familiar visual detail under suitable conditions.

Thermal imaging attachments can be legally owned in the UK, but their use for shooting is subject to applicable firearms, wildlife and hunting legislation.

Rules can vary depending on the species, location, firearm and intended activity. The use of thermal equipment does not remove the requirement to comply with relevant legislation and permissions.

Always check current legal requirements and obtain appropriate professional guidance where necessary.

Can I use a thermal clip-on with my existing rifle scope?

Many thermal clip-on attachments are designed for compatible daytime rifle scopes. However, mounting dimensions, magnification and adapter compatibility must be checked.

Do thermal clip-ons need an infrared torch?

No. Thermal imaging detects heat signatures and does not require infrared illumination to function.

Do thermal clip-ons work in complete darkness?

Yes. Thermal imaging can detect temperature differences in complete darkness, although weather and environmental conditions can affect image quality.

What is the difference between 384px and 640px thermal?

A 640-resolution sensor captures more thermal image detail than a comparable 384-resolution sensor. Overall performance also depends on optics, processing and thermal sensitivity.

Does a thermal clip-on need zeroing?

Requirements vary by model. Some attachments are designed to retain the existing daytime scope setup, but mounting alignment and any manufacturer calibration procedures must be followed. Point of impact should always be verified safely before use.

Are mounting adapters included?

Not necessarily. Adapter availability and included accessories vary between models. Check the individual product's What's in the Box section before purchasing.

Which is better, NocPix MATE or HIKMICRO Thunder?

Both ranges offer different performance options. The better choice depends on sensor resolution, lens size, rangefinding, mounting compatibility and budget. Compare individual models rather than choosing solely by manufacturer.