... performance indicators Magnification ,x2 3 5Objective lens diameter,mm32 44 50 Lens system39mmF/1.2 59mmF/1.7 88mmF/1.7FOV ... ,mm 15Dioper setting,D +4,-4Overall dimensions,mm156×79×50 170×79×50 180×80×50Weight,oz/g14.88/422 18.34 ... , fire stations and public places of safety testing.In short, SC-85 portable night vision is an essential in your life ...