Preparedness Advice Blog
Tag Archives: Fresnel lenses
The other day a friend gave me a Fresnel lens that he removed from a projection television. It is huge, it measures 50 inches by 37 inches. We took and installed it in a wooden frame and have been experimenting with it. Now many of you may be familiar with the small Fresnel lenses that come in many survival kits as a fire starter. They measure approximately 3 ¼ x 1 ½ inches and are very close in size to a business card.
I have had small one for years in a pocket survival kit that I often carry. If the sun is out, they will start a fire. …Read More...