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eBay£1,599.95Visit shop Pixfra Sirius S635 Thermal 35mm f1.0 Monocular 18mK Smart Night Vision (UK) BNIB
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The Pixfra Sirius S635 Thermal Imaging Monocular is designed for wildlife enthusiasts, conservationists, and search-and-rescue personnel who require high-precision thermal detection in challenging outdoor environments. Its primary benefit is the combination of a high-resolution 640x512 sensor with a sensitive 35mm lens, which allows for clear identification of heat signatures at ranges up to 1800 metres. While it offers industry-leading sensitivity, users should note that the 6-hour battery life may require external power banks for extended overnight sessions in the field.
| Brand | PixFra |
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The device features a detection range of up to 1800 metres depending on environmental conditions.
The Sirius S635 is built for rugged outdoor use; however, always refer to the specific IP rating in your manual to understand the exact submersion limits.
Yes, thermal imagers detect heat rather than light, so it is just as effective during the day as it is at night.
The device provides up to 6 hours of continuous operation on a full charge.
Yes, the S635 features an ergonomic focus adjustment ring for precise manual control.
NETD refers to Noise Equivalent Temperature Difference. A lower number (18mK) indicates higher thermal sensitivity, allowing the device to detect smaller temperature variations.
Adjust the manual focus ring on the lens slowly until the image sharpness is restored.
Connect the device to a power source for at least 30 minutes to ensure sufficient charge, then attempt to power on again.
Ensure the lens is clean and the environment is not affected by heavy fog or high humidity, which can attenuate thermal radiation.
To set up the device, perform an initial focus calibration using the manual focus ring while viewing a known heat source at a mid-range distance. Ensure the firmware is kept updated to benefit from the latest AI detection improvements. For care, keep the lens cap on when not in use to protect the sensitive objective lens from debris. Use only a specialized lens cleaning kit designed for thermal optics to avoid scratching the coating. When transporting, use the provided protective case to prevent impact damage. Always recharge the internal battery fully before heading into the field to maximize your operational window.
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