• Front Right view of the Pixfra Sirius S635 Thermal Monocular showing the 35mm objective lens and rugged housing designed for outdoor thermal observation.
  • Front Left view of the Pixfra Sirius S635 Thermal Monocular showing the 35mm objective lens and rugged housing designed for outdoor thermal observation.
  • Top desktop profile of the Pixfra Sirius S635 highlighting the ergonomic grip, control buttons, and connection ports for charging and data transfer.
  • Rear view of the Pixfra Sirius S635 Thermal Monocular displaying the single eyepiece assembly with a rubber eyecup and diopter adjustment control for focusing the thermal display.
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Pixfra Sirius S635 Thermal Imaging Monocular | 640px Sensor & 35mm Lens

  • Thermal Resolution: 640 x 512
  • Thermal Lens: 35mm
  • Pixel Interval: 12µm
  • NETD: < 18mK
  • Thermal FOV: 12.4 x 10°
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.

R 48,999.00
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SKU: PFI-S635

Detection Range

Pig
Kudu
Elephant
1059mDetection
486mRecognition
243mIdentification
1588mDetection
729mRecognition
365mIdentification
3176mDetection
1458mRecognition
729mIdentification

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 S635 Thermal Imaging Monocular Key Features:

• High-Definition Thermal: Equipped with a 640×512 @ 12µm sensor for sharp subject definition and minimal pixelation at higher digital zooms.
• Ultra-Sensitive Detection: A low NETD ≤18mK ensures detection of minute temperature differences, vital for identifying targets in low-contrast environments.
• Immersive Display: Features a large 0.49-inch 1920×1080 OLED screen, offering rich contrast and vivid colors compared to standard LCOS displays.
• Long-Range Performance: Detects human-sized targets at distances up to 1,800m (approx. 1.1 miles).
• Multimedia Ready: Built-in 64GB storage with video recording and snapshot capabilities, easily shareable via Wi-Fi hotspot.
• Durable Power: Powered by a replaceable 18650 lithium battery for up to 6 hours of continuous operation.

Product Overview
The Pixfra Sirius S635 is a high-performance thermal monocular built for professionals who require superior image quality and long-range detection. It combines a high-resolution 640×512 vanadium oxide detector with a 35mm F1.0 lens, delivering crisp, detailed thermal images that allow you to detect heat signatures up to 1,800 meters away.
Designed for ergonomic comfort and ease of use, the S635 features a lightweight 421g body with a "crystal breathing" power button and a premium carbon fiber texture. The visuals are projected onto a stunning 0.49-inch Full HD OLED display (1920×1080), ensuring a cinematic viewing experience even in complete darkness. With a NETD ≤18mK sensitivity, it excels in harsh weather, cutting through rain and fog to reveal targets that other devices miss.

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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 Lens35 mm
Field of View12.4° x 10°
Frame Rate50 Hz
Detection Range (1.7m Subject)1800 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 & Weight194.3mm x 54mm x 65.4mm; 421g
What's in the Box
Box ContentsPixfra Sirus PFI-S635
Replaceable 18650 Battery
USB Type-C Cable
User Manual