Imaging recource: Your telephoto lens could potentially save your life with this little trick

It might not be what you purchased your $2,000 70–200mm f/2.8 lens for, but in an emergency situation did you know can use your telephoto lens as a means to start a fire? In The Modern Man’s Guide to Life, the authors note that in a pinch you could use your lens as a magnifying glass of sorts to focus sunlight onto a pile of tinder in hopes of starting a fire. Specifically the book notes: In a pinch, a telephoto lens will also work to start a fire. Open the lens to the maximum aperture and focus a tiny spot of sunlight on dry tinder by holding the lens...
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