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A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
The Philippines, [e] officially the Republic of the Philippines, [f] is an archipelagic country in Southeast Asia. In the western Pacific Ocean , it consists of 7,641 islands , with a total area of roughly 300,000 square kilometers, which are broadly categorized in three main geographical divisions from north to south: Luzon , Visayas , and ...
All enlargers consist of a light source, normally an incandescent light bulb shining though a condenser or translucent screen to provide even illumination, a holder for the negative or transparency, and a specialized lens for projection, though some, such as the Rapid Rectilinear or Aplanat [citation needed] could be used in both camera and enlarger.
The Petzval objective, or Petzval lens, is the first photographic portrait objective lens (with a 160 mm focal length) in the history of photography. [1] It was developed by the Slovak mathematics professor Joseph Petzval in 1840 in Vienna , [ 2 ] with technical advice provided by Peter Wilhelm Friedrich von Voigtländer [ de ] .
The lens is thus a telephoto lens, nowadays usually used for portrait photography. It's exclusively made for SLR cameras. There are two versions of this lens, namely Jupiter-6 in M39 mount (not to be confused with LTM , this is the SLR version of the mount for early Zenit cameras) and Jupiter-6-2 in M42 mount .
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GQ Calls it the Netflix of Eyewear - Huffington Post
temu.com has been visited by 1M+ users in the past month
The quality of the glasses was outstanding. - Bizrate