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BigV · 03-24-2017, 05:20 PM

Re: Fresnel

I have a large Fresnel lens I scavenged from a big projection TV. On a sunny day it can concentrate enough sunlight to make a dark rag burst into flame in about six seconds.

03-24-2017, 05:20 PM	#13
BigV Goon Squad Leader Join Date: Nov 2004 Location: Seattle Posts: 27,063	Re: Fresnel I have a large Fresnel lens I scavenged from a big projection TV. On a sunny day it can concentrate enough sunlight to make a dark rag burst into flame in about six seconds. __________________ Be Just and Fear Not.