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a fresnel lens has the same properties as a normal lens. fresnel (pronounced fre'nel) comes from the name of its inventor the french physicist augustine fresnel (1788 to 1827). fresnel lenses got their start in lighthouses back in 1822. fresnel lenses can be found today in many places like the rear windows of trucks and vans, traffic signals, car headlights and in overhead projectors. a fresnel lens is a flat lens that obtains the magnification properties of a regular lens by using stepped geometry to create the surface characteristics of a normal glass lens without actually changing its thickness. it does this by having many rings originating from its center each ring has a surface that slightly changes to imitate the exact angle of a true lens. the overall effect is a flat, cheap and lightweight lens.
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July 7
a fresnel lens box is a simple and inexpensive device that you can build yourself. it is simply a cardboard box that surrounds your monitor and holds a fresnel lens in place suspended about six inches in front of your monitor. you can find these lenses in your local book store under the name 'full page magnifier'. don't ask for a fresnel lens, you may get a strange look from the flunky behind the counter. other good sources for higher quality fresnel lenses are science catalogs and places that sell replacement parts for overhead projectors.
i built my fresnel lens box a few months ago and i have to tell you, there is no going back! it makes my 17" monitor look like a 30" monitor and i have the sore neck and bad posture to prove it!
how do you make one you ask, well its simple, follow these instructions and you'll be on your way to gaming bliss.
materials needed: cardboard, fresnel lens, black paint, cutting blade, tape or glue.
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note: for best results you should turn off the lights to cut down on any external glare that may reflect off of the lens surface. if you can't see your keyboard, you can cut an opening on the bottom of your lens box to allow the light from your monitor to illuminate your keyboard.
these instructions should get you on your way to having the coolest 3d enhancement since 3d glasses and if you really want to go for that total immersion experience, you could integrate this into a virtual cockpit surrounding you with controls, padding, sounds and cool lighted gizmos, but hey, that's another article.
warning: some users of this device complain of dizziness and headache so use this at your own risk. in other words, if normal 3d games make you sick, then you better stay back on the porch with the puppies playing pong.
this is how the fresnel box looks
note: to see your entire screen you will need place your face close enough to the
fresnel lens to look through it and peer at your monitor which will appear very large. you will now have the illusion of actually looking through your screen into 3d space and your eyes will focus about 5 feet in front of you.
warning: once you start using this you will never be able to go back to your
boring 2d flat monitor again!
this is how the fresnel box is assembled
note: create the cardboard box and hooks so that the lens is at least 4" or 6" from the monitor. 
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