Pixfra Sirius S635 Thermal Imaging Monocular | 640px Sensor & 35mm LensThe 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 640512 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