Plastic FRESNEL Sheet Lens
This item is a brand new full page Magnification Sheet/FRESNEL Lens Sheet measuring 7" X 10"
Weight: 44 grams
Material: optical PVC
Groove pitch: 0.3mm
Focal length: 30cm (~1 FT)
Size: 7 inch x 10 inch
Fresnel lenses are most often used in light gathering applications, such as condenser systems or emitter/detector setups. Fresnel lenses can also be used as magnifiers or projection lenses. This Lens is also great for the fine print in books, magazines, maps, telephone directories, recipes, etc. This can really be a great and creative gift to children as a toy and senior people who need visual aid.Condition: Re-newed
Similar lens is listed at $63.80 in Edmund industrial Optics catalog.
The real properties of a Fresnel lens are the size and focal length. If you want to buy a Fresnel lens, ask for the size and focal length in advance. For an optical lens, the shorter the focal length, the more power it has. The larger the lens, the brighter the image. For a page size Fresnel lens, it is impossible to fabricate lens with focal length less than 30cm (almost 1 foot). If you got a Fresnel lens, you can check the focal length of it by focusing the sun light.