Nitecore NFR23 22.5mm red filter for flashlights

NFR23 is a 22.5mm diameter red tactical filter for flashlights. Lens made of toughened glass and a frame made of high quality rubber. Filter has a small lanyard hole in it. If you remove the lens, you can use the filter as a bezel protector. The Red filter is great for penetrating fog and smoke, and ideal for signalling. Red is also ideal when you want to preserve your night vision. Hunters use the red filter to avoid disturbing animals during pre-dawn hours - animals see poorly in the red a red beam will always light the path ahead without jeopardising night vision or strategic position. A red beam also perfectly illuminates star maps & lenses without affecting night vision. It won´t attract insects.