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One style is hard contact lenses, which can distort the shape of the cornea to a desired shape. Another style, soft contact lenses, are made of silicone or hydrogel. Depending on the duration they are designed for, they may be worn daily or may be worn for an extended period of time, such as for weeks. [32] There are a number of complication ...
Finally there was the rarely seen 'F3AF', a model which included an autofocus (AF) pentaprism finder (DX-1) capable of autofocusing with two special AF Nikkor lenses—the first of their kind, which included focus motors in the lens bodies. Those lenses were the AF-80mm f/2.8 Nikkor and the AF-200mm f/3.5 Nikkor.
AI lenses enabled lenses to be mounted without having to align the lens with the camera body's "rabbit ears". The F2AS Photomic (DP-12 head) was the most advanced F2 version and the chrome version with Nikkor AI 50 mm f/1.4 lens had a US list price of $1,278 in 1978. (SLR selling prices were typically 30 to 40 percent below list.)
A contact lens (also known simply as a contact) is a corrective, cosmetic, or therapeutic lens usually placed on the cornea of the eye. Modern soft contact lenses were invented by the Czech chemist Otto Wichterle and his assistant Drahoslav Lím , who also invented the first gel used for their production.
Auto-focus available for all "screw-drive" lenses, but no power contacts for power zoom or the later lenses with built-in focus motors. Aperture and shutter information visible in the viewfinder. Focus confirmation in the viewfinder for all lenses of f/5.6 or wider. 17 Custom Functions to help configure the camera to individual preferences.
Zenni Optical mail order. Zenni Optical was founded in 2003 by Tibor Laczay and Julia Zhen. [1] [2] Before being renamed to Zenni Optical when it began offering $7 and $8 glasses, the company was named 19dollareyeglasses.com. [3] [4] [5] Around 2014, co-founder Zhen acquired the building occupied by the Marin Independent Journal to house Zenni. [6]