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  2. Single-lens reflex camera - Wikipedia

    en.wikipedia.org/wiki/Single-lens_reflex_camera

    A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured.

  3. History of photographic lens design - Wikipedia

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

    However, for the record: the first autofocus lens for a still camera was the Konishiroku Konica Hexanon 38mm f/2.8 [171] built into the Konica C35 AF (1977, Japan) 35mm point-and-shoot; the first autofocus lens for an SLR camera was the unnamed 116mm f/8 [172] built into the Polaroid SX-70 Sonar (1978, USA) instant film SLR; the first ...

  4. PRISM - Wikipedia

    en.wikipedia.org/wiki/PRISM

    PRISM is a code name for a program under which the United States National Security Agency (NSA) ... Canada's national cryptologic agency, ...

  5. Abortion in Canada - Wikipedia

    en.wikipedia.org/wiki/Abortion_in_Canada

    The Christian Heritage Party of Canada claims to be Canada's only stated anti-abortion federal political party and supports a total abortion ban in Canada. [ 99 ] [ 100 ] However, they never had a member elected to parliament and won about only 0.05% of the vote in the 2021 Canadian federal election .

  6. Orthokeratology - Wikipedia

    en.wikipedia.org/wiki/Orthokeratology

    Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

  7. Fresnel lens - Wikipedia

    en.wikipedia.org/wiki/Fresnel_lens

    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.

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