Here is a quick video demonstration using a fresnel lens to start a fire. I love these things. They are super rugged and durable. If you’ve got some decent sun they can put out serious heat.
If interested the fresnel lens can be purchased HERE – $12.99 for two with free shipping.
Take care all.
Rourke
When we were kids we used to use a magnifying glass of any size-glass worked better than plastic. Arlene