The GUIDE Orion O435CS Thermal Clip-On gives hog, coyote, and predator hunters an affordable way to add thermal capability to an existing daytime riflescope without replacing the optic, reticle, eye relief, or rifle setup they already trust.

Built around a 400×300 VOx thermal sensor with a 12μm pixel pitch, 15 mK thermal sensitivity, and 50 Hz refresh rate, the Orion O435CS delivers smooth, high-contrast thermal imaging in a remarkably compact package. Its 35mm F/0.9 germanium objective lens provides a strong balance of detection range, field of view, and target detail for hunting across fields, pastures, food plots, and mixed terrain.

At only 10.05 ounces, the O435CS is one of the lightest thermal clip-ons in its class. It adds minimal weight to the front of the rifle, helping preserve the balance and handling of your existing setup.

Add Thermal to Your Existing Daytime Scope

The GUIDE Orion O435CS mounts in front of a compatible daytime riflescope, allowing you to continue using the reticle, magnification controls, eye relief, and shooting position you already know.

Once properly mounted and aligned, you can transition between daytime and thermal use without removing your primary optic. This makes the Orion an excellent option for hunters who want to keep their rifle set up for daytime hunting while adding thermal capability after dark.

Mounting adapter sold separately. The correct adapter ring or mounting system must be selected based on your riflescope and rifle setup.

400×300 Sensor With 15 mK Sensitivity

At the heart of the O435CS is a 400×300 ApexCore S1 thermal detector with a 12μm pixel pitch and 15 mK NETD rating.

The highly sensitive detector recognizes small temperature differences within the scene, helping animals stand out when humidity, fog, rain, vegetation, or changing temperatures reduce thermal contrast.

The 50 Hz refresh rate keeps movement smooth while scanning, following running hogs, or tracking coyotes across open terrain.

ApexVision S1 Image Processing

The Orion O435CS uses GUIDE’s complete ApexVision S1 system architecture, combining:

• ApexCore S1 thermal detector
• Nexus 1.0 processing platform
• Hyper-Light 2.0 image algorithm

Hyper-Light 2.0 processes contrast, brightness, detail, tone, and target separation to produce a cleaner and more usable thermal image. The goal is not simply a brighter picture—it is better separation between the animal and its surroundings.

35mm F/0.9 Germanium Lens

The 35mm F/0.9 objective lens gives the Orion O435CS a strong combination of detection range and target detail.

Its 7.9° × 5.9° field of view covers approximately 43 × 33 feet at 100 yards, making it well suited for hunting fields, pastures, food plots, and other areas where hunters need more reach than a short-range, wide-angle thermal provides.

GUIDE lists a detection range of approximately 1,950 yards under ideal conditions. Detection range represents the ability to recognize the presence of a heat source and should not be confused with positive identification or practical shooting distance.

Thermal Clip-On and Handheld Monocular

The O435CS can also operate as a compact handheld thermal monocular, giving hunters two useful functions in one device.

Use it by hand to scan fields, wood lines, and surrounding terrain, then mount it in front of your daytime riflescope when it is time to take the shot. This versatility can reduce the need to carry separate scanning and weapon-mounted thermal optics.

The 0.39-inch 1024×768 AMOLED display provides strong contrast and offers seven thermal color palettes:

• White Hot
• Black Hot
• Red Hot
• Green Hot
• Iron Red
• Blue Hot
• Sepia

Only 10.05 Ounces

One of the biggest advantages of the Orion O435CS is its compact size and low weight.

The unit measures only 3.90 × 2.87 × 2.67 inches and weighs approximately 10.05 ounces without the mounting adapter. This reduces the front-heavy feel associated with larger thermal clip-ons and makes the rifle more comfortable to carry and maneuver during long nights in the field.

Replaceable 18500 Battery System

The GUIDE Orion O435CS operates on a single replaceable 18500 rechargeable battery and provides up to eight hours of operating time, depending on temperature, settings, and use.

Two batteries and a charger are included, allowing you to keep a fully charged spare ready. The USB-C connection also supports external power when additional runtime is needed.

Built for Real Hunting Conditions

Despite its compact size, the Orion O435CS is rated to withstand recoil energy up to 6,000 joules.

Its IP67 environmental rating protects it against dust and temporary water immersion, providing dependable operation in rain, fog, mud, and other demanding hunting conditions. The listed operating temperature range is -4°F to 122°F.

GUIDE Orion O435CS Features

• 400×300 VOx thermal sensor
• 12μm pixel pitch
• 15 mK NETD thermal sensitivity
• 50 Hz refresh rate
• 35mm F/0.9 germanium objective lens
• 1× optical magnification
• Manual focus
• 7.9° × 5.9° field of view
• Approximately 43 × 33 feet at 100 yards
• Approximately 1,950-yard detection range
• ApexVision S1 system architecture
• ApexCore S1 thermal detector
• Nexus 1.0 processing platform
• Hyper-Light 2.0 image algorithm
• 0.39-inch 1024×768 AMOLED display
• Seven thermal color palettes
• Clip-on and handheld monocular capability
• Replaceable 18500 rechargeable battery
• Up to eight hours of runtime
• USB-C external power support
• Rated for recoil energy up to 6,000 joules
• IP67 dust and water protection
• Operating temperature from -4°F to 122°F
• Compact 3.90 × 2.87 × 2.67-inch housing
• Lightweight 10.05-ounce design

Warranty Information

GUIDE Thermal USA backs the Orion O435CS with:

• 10-year warranty on the thermal sensor
• Five-year warranty on other device components
• Two-year warranty on accessories, including batteries, chargers, and cables

The GUIDE Orion O435CS is an excellent option for hunters who want a lightweight and affordable thermal clip-on without paying for features they may never use. It provides a sensitive 400×300 thermal image, a useful 35mm lens, replaceable batteries, handheld capability, and a rugged housing in one of the smallest packages in its class.

If you are unsure whether the Orion O435CS will work with your current scope or hunting setup, call or text Southern Precision Outdoors before ordering. We will help you determine whether this is the right thermal clip-on and select the correct mounting adapter for your optic.

Export of night vision/thermal equipment and optical sighting equipment is controlled by the U.S. Department of State Office of Defense Trade Controls, in accordance with International Traffic in Arms (ITAR), Title 22, Code of Federal Regulations Part 120-130 and/or the Export Administration Regulations (EAR) U.S. Department of Commerce. Please see below for more information.