As the cost of thermal imaging cameras has dropped ... is constantly evolving to make hunting easier, whether it be rifle scopes with clearer glass that automatically calculate range, duck ...

[David Prutchi] writes in to tell us about his recent experiments with building lenses for thermal imaging cameras, which to his knowledge is a first (at least as far as DIY hardware is concerned).

This thermal clip-on device is a huge night-time gear multiplier for hunters and observers, transforming any daytime scope into a thermal sight.

rifle, crossbow, helmet, tripod, car, boat, iPad, phone, or even a bike—essentially, any situation where a thermal imaging scope could be useful. Unlike thermal cameras used for DIY and ...