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2. Spotting scope - Wikipedia

   en.wikipedia.org/wiki/Spotting_scope

   Spotting scope. A 100mm spotting scope with a paraxial 30mm finderscope. A spotting scope is a compact lightweight portable telescope optimized for detailed observation of distant objects. [1] They are used as tripod mounted optical enhancement devices for various outdoor activities such as birdwatching, skygazing and other naturalist ...

3. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   Non-imaging lenses can be classified as: Spot A non-imaging spot Fresnel lens uses ring-shaped segments with cross sections that are straight lines rather than circular arcs. Such a lens can focus light on a small spot, but does not produce a sharp image. These lenses have application in solar power, such as focusing sunlight on a solar panel.

4. List of soft contact lens materials - Wikipedia

   en.wikipedia.org/wiki/List_of_soft_contact_lens...

   The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...

5. Shack–Hartmann wavefront sensor - Wikipedia

   en.wikipedia.org/wiki/Shack–Hartmann_wavefront...

   A Shack–Hartmann (or Hartmann–Shack) wavefront sensor ( SHWFS) is an optical instrument used for characterizing an imaging system. [ 1][ 2] It is a wavefront sensor commonly used in adaptive optics systems. It consists of an array of lenses (called lenslets) of the same focal length. Each is focused onto a photon sensor (typically a CCD ...

6. AOL Mail

   mail.aol.com

   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

7. Astigmatism (optical systems) - Wikipedia

   en.wikipedia.org/wiki/Astigmatism_(optical_systems)

   Astigmatism (optical systems) An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- ( a ...

8. Condenser (optics) - Wikipedia

   en.wikipedia.org/wiki/Condenser_(optics)

   Condenser (optics) A condenser is an optical lens that renders a divergent light beam from a point light source into a parallel or converging beam to illuminate an object to be imaged. Condensers are an essential part of any imaging device, such as microscopes, enlargers, slide projectors, and telescopes. The concept is applicable to all kinds ...

9. Focus (optics) - Wikipedia

   en.wikipedia.org/wiki/Focus_(optics)

   In geometrical optics, a focus, also called an image point, is a point where light rays originating from a point on the object converge. [1] Although the focus is conceptually a point, physically the focus has a spatial extent, called the blur circle. This non-ideal focusing may be caused by aberrations of the imaging optics.