What are lenses?

Some articles on lenses:

Lurie–Houghton Telescope
... hard to make Schimdt and Maksutov corrector lenses, the corrector for the Lurie–Houghton is relatively easy to make ... It consists of two lenses, a positive and a negative, at the front of the telescope which sets the size of the aperture ... These lenses are relatively thin, though not as thin as the Schmidt corrector ...
Polaroid Eyewear - Manufacturing Techniques
... Polaroid Eyewear uses press-polishing to manufacture their polarized lenses ... It also allows Polaroid Eyewear to produce lenses that are thicker at the center and tapered towards the edges ... Greater degrees of curvature in polarized lenses for 2-, 6-, and 8-base frames and 6-base masks, plus toric lenses, are possible ...
Minolta CLE - Lenses
... Three lenses were made by Minolta specially for the CLE the M-Rokkor 28mm f2.8 wide-angle, the M-Rokkor 40mm f2 standard and the M-Rokkor 90mm f4 tele ...
Canon EF 70-300mm Lens - EF 70-300mm F/4-5.6 IS USM
... introduced in 2005, to offer an increase in performance from the earlier 75-300mm lenses in the Canon EF lens lineup ... lens is competitive to Canon's L series telephoto zoom lenses, such as the 70-200mm series of lenses ... lens, and is usually found only in Canon's L-series lenses ...
List Of Lens Designs
... designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties ... Some lenses listed are overall types with sub-designs (as noted) ...

Famous quotes containing the word lenses:

    Life is a train of moods like a string of beads, and, as we pass through them, they prove to be many-colored lenses which paint the world their own hue, and each shows only what lies in its focus.
    Ralph Waldo Emerson (1803–1882)