• Pixfra Sirius S650 front right view showing the cylindrical body with green rings, lens cap, and the model name and brand logo on the right side.
  • Pixfra Sirius S650 front left view showing the objective lens, green rings, and the power button located on the side of the device.
  • Pixfra Sirius S650 rear right view showing the eyepiece with OLED display visible, menu buttons on top, and the brand logo on the right side.
  • Pixfra Sirius S650 rear left view showing the eyepiece, the power button on the side, and the texture of the cylindrical body.
  • Pixfra Sirius S650 side profile view showing the full length of the device with menu buttons on top, green rings, and the model name and brand logo on the right side.
  • Pixfra Sirius S650 submerged in water showing the lens cap and cylindrical body to demonstrate the IP67 waterproof rating.
  • Person holding Pixfra Sirius S650 up to their eye showing the side profile, green rings, and ergonomic grip during use.
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Pixfra Sirius S650 Thermal Imaging Monocular

  • Thermal Resolution: 640 x 512
  • Thermal Lens: 50mm
  • Pixel Interval: 12µm
  • NETD: < 18mK
  • Thermal FOV: 8.8 x 7.1°
What do these specs mean?

Understanding Thermal Specs

Thermal Resolution

Think of this like a TV screen (e.g., 1280x1024). A higher number means more pixels. More pixels give you a sharper, more detailed image, allowing you to digitally zoom in much further before the image gets blurry or pixelated.

Thermal Lens

Similar to a camera lens, measured in millimeters (e.g., 50mm). A larger lens gathers more thermal energy and "sees" further, giving you a longer detection range. However, larger lenses typically result in a narrower field of view.

Pixel Interval (Pitch)

The physical distance between pixels on the sensor, measured in microns (e.g., 12µm). A smaller number means the pixels are packed tighter together, which produces a crisper image and extends your optical magnification without needing a massive lens.

NETD (Thermal Sensitivity)

Measures how tiny of a temperature difference the device can detect. Lower is better (e.g., < 15mK beats < 25mK). A lower NETD means you get a much clearer picture in terrible weather (rain, thick fog, high humidity) and superior contrast between the animal and its surroundings.

Thermal FOV (Field of View)

How wide of an area you can see at once. A wider FOV is excellent for scanning large areas quickly to spot movement. A narrower FOV usually means the device has higher magnification, perfect for identifying specific targets at long distances.

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SKU: PFI-S650

Detection Range

Pig
Kudu
Elephant
1529mDetection
694mRecognition
347mIdentification
2294mDetection
1042mRecognition
521mIdentification
4588mDetection
2083mRecognition
1042mIdentification

Understanding the Math

We believe in honest, real-world field specifications.

Detection ranges are calculated by taking the manufacturer's baseline testing and physically scaling it to the average height of the target animal.

Recognition & Identification are calculated using Johnson's Criteria—the military standard for thermal optics. By analyzing the physical properties of the camera's lens and sensor pitch, we calculate exactly when the target will take up enough pixels on your screen to be clearly identified.

Note: High humidity, thick coats, and environmental background temperatures will reduce these maximum optical distances in the field.
Key Features & Highlights

Pixfra Sirius S650 Thermal Imaging Monocular Key Features:

• Extreme Detection: Detect human-sized heat signatures up to 2,600m (1.6 miles).• Ultra-Fast Optics: Large 50mm F0.9 lens captures more thermal data for superior low-light performance.• High-Res Sensor:640×512 resolution (12µm) ensures crisp identification at high magnification.• Immersive Display:0.49-inch OLED (1920×1080) offers a sharp, cinematic viewing experience.• All-Weather Performance:NETD ≤18mK sensitivity cuts through fog, smoke, and heavy foliage.• Multimedia Ready: Record audio and video to the 64GB internal memory or stream via the Pixfra Outdoor App.

Product Overview
The Pixfra Sirius S650 is the long-range specialist of the Sirius thermal monocular family. Designed for open-country hunting, maritime surveillance, and professional search and rescue operations, this device pairs a high-resolution 640×512 thermal detector with a powerful 50mm objective lens. This optical combination delivers maximum detection range and superior detail at extended distances, allowing you to spot heat signatures well beyond the capabilities of standard 35mm models.

The S650 is built for scenarios where distance is the primary challenge. Its 50mm focal length provides a narrower, more magnified field of view compared to the S635, making it the ideal choice for identifying targets at long range rather than wide-area scanning close up. Powered by Pixfra's proprietary image processing and a high-sensitivity detector (typically NETD ≤18mK for this series), it cuts through environmental obscurants like fog and rain to deliver reliable intelligence in any lighting condition.

Pixfra Sirius S650 Thermal Imaging Monocular Useful Resources:

Pixfra Sirius S650 Specifications
Pixfra Thermal Imaging Products
Pixfra Thermal Outdoor APP for IOS and Android


Pixfra Sirius S650 Unboxing.

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Technical Specifications

While we strive for absolute accuracy, manufacturer specifications and hardware configurations are subject to change without prior notice. For mission-critical applications, we recommend consulting our team to verify current technical data.

Thermal Specifications
Sensor TypeVanadium oxide uncooled focal plane detector
Thermal Resolution640 x 512
Pixel Pitch12 µm
NETD< 18 mK
Thermal Lens50 mm
Field of View8.8° x 7.1°
Frame Rate50 Hz
Detection Range (1.7m Subject)2600 m
System & Display
Display Info0.49 inch OLED (1920 × 1080 Resolution)
Digital Zoom1×, 2×, 4×, 8×
Storage Capacity64
Battery Life6
Physical & Environmental
Protection Level (IP Rating)IP67
Operating Temperature–30 °C to +55 °C
Dimensions & Weight213.1mm x 73mm x 83.4mm; 537g
What's in the Box
Box ContentsPixfra Sirus PFI-S650, Replaceable 18650 Battery, USB Type-C Cable, User Manual