Thermtec Ventus 650L Multi-Spectrum Thermal BinocularsThermTec Ventus 650L Long Range Multi Spectrum Thermal Binoculars for Australian Hunters The ThermTec Ventus 650L is the long range flagship of the Ventus series a 5 in 1 multi spectrum binocular that combines thermal imaging, 4K digital day vision, dual band infrared night vision, and an integrated laser rangefinder in a single ergonomic body. Built around a larger 50mm F1. 0 germanium thermal lens, the 650L pushes detection range out to an