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This list covers optical lens designs grouped by tasks or overall type. The field of optical lens 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, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...
In March 2009, the German company Novatec Biosol constructed a Fresnel solar power plant known as PE 1. The solar thermal power plant uses a standard linear Fresnel optical design (not CLFR) and has an electrical capacity of 1.4 MW. PE 1 comprises a solar boiler with mirror surface of approximately 18,000 m 2 (1.8 ha; 4.4 acres). [12]
Fisheye lens; first 600 units used a different barrel construction internally; [17] optically similar to the Minolta MC Fish-Eye Rokkor 16mm f / 2.8 (a.k.a. Leica Fisheye-Elmarit-R 16mm f / 2.8) produced up to 1981 with an optical design originally introduced in 1966/1968.
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.
As diffraction is based on aperture width in absolute terms rather than the f-stop ratio, lenses for very small formats common in compact cameras rarely go above f/11 (1/1.8") or f/8 (1/2.5"), while lenses for medium- and large-format provide f/64 or f/128.
The lack of an internal autofocus motor means that this lens cannot utilize its autofocus capabilities on entry-level camera bodies such as the D40, D60, D3000, D5000, D3100 or D5100; however, a newer version of the same lens, the Nikon AF-S Nikkor 50 mm f/1.8G, will autofocus successfully on these cameras. [2]
The normal "full-stop" f-number scale for modern lenses is as follows: 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32, but many lenses also allow setting it to half-stop or third-stop increments. A "slow" lens (one that is not capable of passing a lot of light through) might have a maximum aperture from 5.6 to 11, while a "fast" lens (one that can ...
The Minolta AF Macro 100 mm f / 2.8 lens is a discontinued macro lens produced by Minolta that was renowned for its sharpness [2] all the while garnering raving reviews [3] also. This lens achieves a true 1:1 magnification of the subject matter of interest to the photographer.