Expert Review Lightweight, compact, and superb - NiteHog Viper 35 1x29.17mm Thermal Monocular

The Nitehog Viper-35 is the lightest and most compact thermal clip-on I have used with a length of 46mm and a width of 63mm and weight of 254g. Despite its size and weight, its build quality is robust and durable. The Viper is built from one solid piece of magnesium alloy, and its rugged design and construction are impressive. At just under 9 ounces, it adds hardly any weight to any rifle setup, which can be critical on long hunts.
The sensor has a solid 320x240 resolution that pairs with a 1024x768 resolution display. The Viper comes with (2) 18650 Li-Ion batteries. It runs on one battery at a time, and each battery will give the user a full 5 hours of runtime. In my experience, the battery lasted at 4 hours and 40 minutes under the second lowest brightness setting.
The Viper provides crisp and clear imagery with four different display modes ranging from white hot, black hot, red hot, and isotherm. Long range detection is at an impressive 1500 yards. Paired with a good quality riflescope, the Viper is more than capable of making highly accurate shots at 300-400 yards.
Nitehog states that there should be a sub MOA impact shift when mounting from one rifle to another and that claim held true in my experience. The thread pitch on the Viper is M33.5x0.75, which is common with European thermals. Installation is simple and can be achieved in seconds.
The Viper’s settings are simple to access and manipulate. There are 3 buttons along the top of the optic. Press and hold any 2 of them to enter the menu. Thereafter, you use the top 2 buttons to scroll up and down and the bottom button to select. Within the menu, you’ll find a variety of settings. These include brightness, contrast, view modes, environment modes, weather conditions, and more.
The Viper is entirely built in the EU and comes with a generous 5 year warranty. Given its build-quality, lightweight design, sensor performance, and warranty – the Viper is one of the better clip-ons available today. It’s a phenomenal option for Hunters that don’t require photo or video imaging, but want the best quality thermal that’s strong and very capable.