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Contact lens or contact, a lens placed on the eye; Contact sport, a sport in which players make contact with other players or objects; Contact juggling; Contact mechanics, the study of solid objects that deform when touching each other; Contact process (mathematics), a model of an interacting particle system; Electrical contacts
A multifocal diffractive lens is a diffractive optical element (DOE) that allows a single incident beam to be focused simultaneously at several positions along the propagation axis. [ 1 ] Example of multifocal peak intensity distribution along optical axis.(Courtesy of Holo/Or) Intensity distribution of multifocal lens 5 foci in Z-X plane
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The formula is just beyond-the-pale amazing, the kind of product that would be good at any price, but for less than $10? You cannot beat it. ... or irritating on the days I wear my contact lenses ...
The lens had a unique bayonet mount optics, "jumping" diaphragm and 13 aperture blades. The aperture control ring was placed on the back of the lens and switched in steps. The workmanship was of a very high standard. The second Helios-44 served as a standard lens for Zenit-3 SLR cameras in 1960-62.
Hoya Corporation (Hoya株式会社, Hōya Kabushiki-gaisha) is a Japanese company manufacturing optical products such as photomasks, photomask blanks and hard disk drive platters, contact lenses and eyeglass lenses for the health-care market, [4] medical photonics, [5] lasers, photographic filters, medical flexible endoscopy equipment, and software.