FresnelLensfor sale

Quark2 640 (both 60 and 30 fps), and Muon 640 are controlled to the ITAR, and require export licenses from the U.S. Department of State prior to delivery outside of the U.S. or Canada.

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FLIR's OEM camera modules — including Tau2 640 (both 60 and 30 fps), Tau2 336, Tau2 324, Quark2 336 and Muon 336 — are classified as dual-use items and require export licenses from the U.S. Department of Commerce.

The most important part of a lighthouse might be one of the beautiful tools hidden inside of it: the Fresnel lens, a breakthrough that changed seafaring and saved lives.

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Fresnellenslighthouse

As the above video shows, these lenses satisfied a need for lighthouses that could shine farther and through dense layers of fog. The Fresnel lens, invented by Augustin-Jean Fresnel, helped do that by capturing all the light coming from a lamp, then magnifying and steering it in one direction. Suddenly, lighthouses became more useful and shipwrecks diminished.

The U.S. government allows thermal cameras with frame rates less that 9 fps to be exported without a license. This is why FLIR offers thermal cameras with "fast video" and "slow video" options.

Fresnel lenses are still in operation today. According to the US Lighthouse Society, more than 75 Fresnel lenses are in use in American lighthouses, and businesses such as Dan Spinella’s Artworks Florida craft replicas that capture the beauty — and functionality — of the 19th-century breakthrough.

Thermal cameras operating at 60 fps and/or 30 fps (NTSC) or 50 / 25 fps (PAL) video rates are export-controlled by the U.S. government.