Thermal imaging devices are an essential tool for any outdoor enthusiast, providing a close-up view of nature, the stars, or any other distant object. But for thermal imaging devices to work properly, the user must be able to adjust the focus of each eyepiece for a clear image. This is achieved by adjusting the diopter adjustment of the thermal imaging devices.
The diopter adjustment range of a binocular is the range of power of the diopter that can be adjusted on the thermal imaging devices. A -6 - 4 dpt binocular diopter adjustment range is a diopter range that allows the user to adjust the focus of each eyepiece from -6 to +4 diopters, giving them the ability to get the clearest image possible.