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There is not a very clear distinguishing line between camera producers and lens producers; many companies do both, or have done both at one time or another. Some camera manufacturers sell lenses made by others as their own, in an OEM arrangement. Some camera makers design lenses but outsource manufacture. Some lens makers have cameras made to ...
Vivitar Corporation is a manufacturer, distributor, and marketer of photographic and optical equipment originally based in Santa Monica, California. [citation needed] Since 2008, the Vivitar name serves as Sakar International's house brand for digital imaging, optics, mobile accessories, and audio products.
A photochromic eyeglass lens, part of the lens darkened after exposure to sunlight while the other part remained covered. A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state.
Once process and tool have been developed, precision glass moulding has a great advantage over conventional production techniques. The majority of the lens quality characteristics are tool-bound. This means that lenses, which are pressed with the same tool and process, usually have only insignificantly small deviations.
The most famous example is the Rapid Rectilinear Lens developed by John Henry Dallmeyer in 1866. It allowed distortionless photos to be taken quickly for the first time, and was a standard lens design for 60 years. [1]: 59 As of 2020, the Laowa 9mm f/5.6 lens is the world's widest rectilinear lens for full frame cameras.
Asahi Optical used the name Takumar for their lenses. These were high-quality, progressively improved lenses, later versions of which featured multi-coating and were called Super Multi Coated Takumars. The camera used Through The Lens (TTL) light metering, originally it was supposed to be a Spot meter but it ended up being a center-weighted meter.