Tag Archives | Fresnel Lens

SAM_0030

That Fresnel Lens in Your Survival Kit

By on May 14, 2013 in Firecraft, Master Woodsman, Survival Kit, Wilderness Survival

Today’s common Fresnel lens, and the one a Woodsman should carry, is a super-thin business card sized piece of plastic.  Based on the 1822 lens design by French physicist Augustin-Jean Fresnel, it was originally intended for lighthouses, hence it’s larger aperture, shorter focal length and much thinner design compared to conventional lenses. For a lighthouse, […]

Read full story • Comments { 4 }