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09-04-2017, 07:58 AM   #16

Join Date: May 2010
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So carry around a camera lens if you go camping.. in the middle of the day it can help you start a campfire? And the reflection off the front element can help flag rescue to your location perhaps. It could be the macgyver of tools. Plus, if a bear attacks, and you're holding one of those old metal bodied Pentax M bodies, you can throw it at the bear and knock it out. ..or at least make it really angry before it eats you.

09-04-2017, 01:35 PM   #17
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QuoteOriginally posted by mee Quote
So carry around a camera lens if you go camping.. in the middle of the day it can help you start a campfire? . . . .
start a fire with a lens

In a word


" This is a lens in which both surfaces are curved so that a beam of light passing through it is brought to a point or focus. A convex lens can be used to start a fire by directing the sun's rays to a point (your tinder) so it should only be used on bright, sunny days.

The lens can come from binoculars, camera, magnifying glasses; even ice can be used if it is carved in a shape similar to convex lens. (The ice must be highly transparent to behave as if it's a convex lens). "

Convex Lens | Starting a fire using a convex lens

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