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2. List of soft contact lens materials - Wikipedia

   en.wikipedia.org/wiki/List_of_soft_contact_lens...

   Types. The FDA classifies soft contact lenses into four groups for the US market. They are also subcategorized into 1st generation, 2nd generation, and 3rd generation lens materials. [6] These 'water-loving' soft contact lens materials are categorized as "Conventional Hydrophilic Material Groups ("-filcon"): Group. Water Content.

3. History of photographic lens design - Wikipedia

   en.wikipedia.org/wiki/History_of_photographic...

   Regular wide angle lenses (meaning lenses with focal length much shorter than the format diagonal and producing a wide field of view) need to be mounted close to the film. However, SLR cameras require that lenses be mounted far enough in front of the film to provide space for the movement of the mirror (the "mirror box"); about 40 mm for a 35mm ...

4. Schmidt camera - Wikipedia

   en.wikipedia.org/wiki/Schmidt_camera

   The Schmidt camera was invented by Estonian-German optician Bernhard Schmidt in 1930. [1] Its optical components are an easy-to-make spherical primary mirror, and an aspherical correcting lens, known as a Schmidt corrector plate, located at the center of curvature of the primary mirror. The film or other detector is placed inside the camera, at ...

5. Pentax K1000 - Wikipedia

   en.wikipedia.org/wiki/Pentax_K1000

   The Pentax K1000 (originally marked the Asahi Pentax K1000) is an interchangeable lens, 35 mm film, single-lens reflex (SLR) camera, manufactured by Asahi Optical Co., Ltd. from 1976 to 1997, originally in Japan. [1] [2] The K1000's extraordinary longevity makes it a historically significant camera. The K1000's inexpensive simplicity was a ...

6. Miranda Camera Company - Wikipedia

   en.wikipedia.org/wiki/Miranda_Camera_Company

   The Miranda Camera Company (ミランダカメラ㈱) , originally named the Orion Camera K.K. (オリオンカメラ㈱) in 1955 and Orion Seiki Sangyō Y.K. (オリオン精機産業有限会社) in 1947, manufactured cameras in Japan between 1955 (69 years ago) and 1976 (48 years ago). Their first camera was the Miranda T. Many of their ...

7. The best Memorial Day sales that are already live from ... - AOL

   www.aol.com/lifestyle/best-memorial-day-sales...

   LG 70” 4K UHD Smart TV. $498 $648 Save $150. If you've been thinking about upgrading your TV, now would be the right time to do so. Outside of Black Friday, Memorial Day sales offer some of the ...