Have you ever started a fire with a magnifying glass in science class or girl/boy scouts? Well, in my search for a zero energy means of cooking, I came across fresnel lenses. These are strong magnifying lenses that have a variety of uses including reading magnification, flat screen televisions, RVs and motor vehicles to help with blind spots, as well as to start fires. Yes you read that correctly.

Some of you are probably familiar with fresnel lenses as they are used by science enthusiasts, outdoorsmen, survivalists, and homesteaders for the purpose of fire starting and cooking. They make lighting a piece of wood almost effortless once the right angle to the sun and focal length is found. Depending on the strength of the lens and what type it is, temperatures in excess of 2000 degrees Fahrenheit can be reached, melting a nickel penny, within a matter of seconds.

There are two types of fresnel lenses. They are known as either spot or linear lenses. They magnify differently so that the spot lens condenses the sun into a very intense circular spot about a half an inch at its strongest. The linear lenses condense the sun into a weaker thin beam of light which is due to the way it spreads out the light. Both can get hot enough to cook with. The linear lenses are said to be best for cooking because they disburse the sun more evenly over a larger area. That makes the temperature lower, but still very hot.

To be sure, these can also be quite dangerous. I weighed the risks and rewards, deciding it would be a good investment for our homestead. I chose to get a smaller spot lens that has been measured to reach approximately 1000 degrees at full strength. In the future I'll be designing an outdoor cooking area using a combination of offgrid cooking tools. This is the first element which I will be able to use immediately.

Proper safety is important. I will be using welding goggles and bbq mitts that can withstand heat of up to 1400 degrees, as well as trying to construct a sturdy flexible stand and safety backdrop of cob (I think. Still thinking on it). It's also important to have a laser thermometer and use cooking utensils that will not explode, melt, catch fire, or warp. That's why it's smart to have the heat gun thermometer to accurately measure temperatures. I plan to use stainless steel, cast iron, and cob.

Some people go hunting for free discarded flat screen tvs in order to disassemble them for the fresnel lenses they contain. I chose to buy from a company called Green Power Science. I've watched a lot of their YouTube video demonstrations, which you can view on their channel here. If you want to learn more about what fresnel lenses are, how they work, etc, be sure to check out their website. Here is a video about cooking eggs with the fresnel lens. Can't wait to get cooking myself!

I also purchased 6 linear feet of highly reflective mirrored aluminum with a sticky back so that in the future I can try my hand at building a solar oven. I purchased these items Monday and received them yesterday. Fast shipping and everything looks good to me except for a spot on the lens where it looks like a dribble of glue from the frame trickled down. This shouldn't affect the function of the lens. Excited to give the lens a try soon. Hopefully it won't take me months to work on building a solar oven, but I know I have a really good reflective material on hand whenever the project gets started. This post will be showing you what I got in a STEEMIT EXCLUSIVE UNBOXING. { :

The lens I chose is a 15" square spot lens in a nicely made frame. On each side of the frame is a small predrilled hole to attach it to a stand with butterfly screws so it can be angled perpendicular to the sun. I don't have a stand made yet. I will probably also want to paint or stain the frame to help it last longer.

I got this size of a spot lens because I don't need the temperature to reach 2000 degrees in a few seconds. On the listing this was the data:

SIZE-----------------15H X 15W
BEAM-----------------SPOT
BEAM SIZE MAX POWER--0.3 INCH
FOCAL LENGTH---------18 INCHES
WEIGHT --------------2 LBS.
MAX TEMP. CLIMB------970 F IR THERMOMETER
MAX COLLECTION-------1099F MATERIAL EST...........
MATERIALS TESTED:
WATER-------5oz. BOILS 50 sec.
GLASS-------MELTS 1/8 OUNCE
ZINC PENNY--15 SECONDSΩ

data source

I will also be able to control the temperature by adjusting the distance from the lens to whatever I'm going to cook. That distance is what is known as the focal length. The hottest, most efficient, focal length for this one is supposed to be 18". If I want a lower temperature and larger coverage area, I should be able to pull this away by a few inches. I'll know more once I experiment.

The lens was well packed with a thick layer of cardboard on each side and within a snug box cut to the specific dimensions of it. The lens itself was covered in several layers of saran wrap.

Of the top edge were two very helpful labels. One with the warning that this is not a toy and it can be very dangerous if left where sun can hit it. The other explaining which side faces the sun.

This is the highly reflective material I will be using for the reflective backing for the sun oven. It can also be used to make a parabolic mirror. As you can see it's got some stuff on the left side but that's actually just dust particles. At first I thought it was scuffed but it wiped away. Now I have to either find a solar oven design I want to try making, or come up with my own design. I like designing so I am leaning on going in that direction.

To make the experience extra special, they even drew a sunny smiley face and gave a little extra of the reflective material. The dimensions that can be ordered are 1'x2'. I bought 3 of those, so should have about 6 linear feet.

Hope you enjoyed this unboxing. Be sure to check out Green Power Science for more information. If you are interested in purchasing from them, check their ebay store. If you found this post enjoyable, please consider upvoting, resteeming, following, and commenting! Thank you kindly for reading...

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FREE ENERGY COOKING: I GOT A FRESNEL LENS!!

I got this size of a spot lens because I don't need the temperature to reach 2000 degrees in a few seconds. On the listing this was the data:

The lens was well packed with a thick layer of cardboard on each side and within a snug box cut to the specific dimensions of it. The lens itself was covered in several layers of saran wrap.

Of the top edge were two very helpful labels. One with the warning that this is not a toy and it can be very dangerous if left where sun can hit it. The other explaining which side faces the sun.

To make the experience extra special, they even drew a sunny smiley face and gave a little extra of the reflective material. The dimensions that can be ordered are 1'x2'. I bought 3 of those, so should have about 6 linear feet.

Hope you enjoyed this unboxing. Be sure to check out Green Power Science for more information. If you are interested in purchasing from them, check their ebay store. If you found this post enjoyable, please consider upvoting, resteeming, following, and commenting! Thank you kindly for reading...

ALL IMAGES ARE COPYRIGHT 2018 BY ME, Hive account@phedizzle. Hope you enjoyed them!

Here are previous posts of mine:

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2011 GARDEN:

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