GUIDE ORION 635CS CLIP-ON 640 X 512 PX THERMAL IMAGING CAMERA

The Guide Orion O635CS is a compact thermal attachment that mounts in front of a daytime optical sight using a suitable adapter. Its 640 × 512 pixel VOx sensor and thermal sensitivity of up to 15 mK help distinguish small temperature differences. The 35 mm F0.9 lens provides a field of view of 22 × 17 metres at a distance of 100 metres, helping you observe both the heat source and its surroundings.

Suitable for

• Adding a removable thermal attachment to daytime optics

• Watching game movement in twilight and darkness

• Observing forest edges and open clearings

• Outdoor observation where a wide field of view and low additional weight are important

• Handheld observation with a compatible additional eyepiece

Why choose the Guide Orion O635CS?

• The 50 Hz frame rate keeps the thermal image smooth even when changing the viewing direction.

• The 1920 × 1080 pixel AMOLED display offers a choice of seven colour palettes.

• The manual focus knob can be used while wearing gloves.

• The 285 g housing and 99 mm length help keep the clip-on compact.

• According to the manufacturer, the device starts up in approximately three seconds.

• Two replaceable 18500 batteries and a charger are included.

Technical specifications

• Manufacturer: Guide Outdoor

• Product series: Orion C

• Model: O635CS

• Product type: thermal imaging clip-on

• Thermal sensor: uncooled VOx

• Sensor resolution: 640 × 512 px

• Pixel pitch: 12 µm

• Spectral range: 8–14 µm

• Thermal sensitivity (NETD): ≤15 mK

• Frame rate: 50 Hz

• Imaging system: ApexVision S1, with Hyper-Light 2.0 image processing

• Lens: 35 mm, F0.9

• Optical magnification: 1×

• Focus: manual

• Field of view: 12.5° × 9.4°

• Field of view at 100 m: 22 × 17 m

• Heat source detection range: up to 1800 m according to the manufacturer

• Display: AMOLED, 1920 × 1080 px

• Colour palettes: 7

• Eye relief: 20 mm

• Device-side mounting thread: M33.5 × 0.75

• Power supply: 1 × replaceable 18500 battery

• Operating time on one battery: up to 7 hours according to the manufacturer

• External power connection: USB-C

• Protection rating: IP67

• Operating temperature: −20 to +50 °C

• Dimensions: 99 × 73 × 68 mm

• Weight: 285 g

Included

• Guide Orion O635CS thermal attachment

• 2 × rechargeable 18500 batteries

• Battery charger

• USB-A–USB-C cable

• Carry bag

• Lint-free cleaning cloth

• Quick guide and warranty card

Frequently asked questions

Which adapter is suitable for attaching the Guide Orion O635CS to an optical sight?

The adapter must fit both the Orion O635CS M33.5 × 0.75 thread and the outside diameter of the optical sight's objective housing. The adapter is selected and purchased separately. For example, for a sight with a 50 mm objective lens, measure the housing at the point where the clamp attaches to choose an adapter.

Can the Guide Orion O635CS be used as a handheld thermal monocular?

Yes, with a compatible observation eyepiece. For example, the Rusan modular 2.5× eyepiece also requires a Rusan MCR connector compatible with the O635CS thread.

What does the Guide Orion O635CS detection range of up to 1800 m mean?

This is the manufacturer's figure for detecting a heat source. Identifying an animal's species requires more detail to be visible in the image, and the distance at which this is possible depends on the animal's size, the weather and the background.

Does the Guide Orion O635CS work with an external power supply?

Yes. The device can be powered externally via USB-C. The replaceable 18500 batteries can be charged with the included battery charger.

When is the Guide Orion O635CS the right choice?

The O635CS is suitable if you want to continue using your daytime optics and need a wider field of view than the Orion O435CS offers. Both models have a 35 mm lens, but at a distance of 100 metres the O635CS covers 22 × 17 m and the O435CS covers 13 × 10 m. The difference matters, for example, when watching a forest edge and you want to see a wider area at once.

If your main use is handheld observation, a dedicated thermal monocular, such as the ThermTec Cyclone 625, is a more convenient choice. It lets you start observing without choosing an additional eyepiece and connector.

Our recommendation

Before ordering an adapter, note the exact model of your optical sight and measure the outside diameter of the objective housing where the clamp attaches. Also check how much clearance there is around the housing. If you intend to use the thermal attachment with several sights, check the measurements of each sight separately. Objective lenses with the same nominal diameter may have housings with different outside diameters.

When trying it for the first time, start with a lower magnification on your daytime sight to assess the visible field of view and the visibility of the display edges. Try the same view with a couple of different colour palettes. Choose a palette that lets you distinguish both the heat source and its surroundings. For a longer trip, charge both batteries and keep the spare battery in a battery case so it is handy when you need to change it.

Guide Orion O635CS for adding thermal imaging to daytime optics

The Guide Orion O635CS is suitable if you want a lightweight thermal attachment for your existing sight, with a wide field of view that helps you observe your surroundings. Choose an adapter that fits your optics and order the device using product code GUIDEO635CS.