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  2. Catadioptric system - Wikipedia

    en.wikipedia.org/wiki/Catadioptric_system

    Examples of sub-aperture corrector catadioptric telescopes include the Argunov–Cassegrain telescope, the Klevtsov–Cassegrain telescope and sub-aperture corrector Maksutovs, which use as a "secondary mirror" an optical group consisting of lens elements and sometimes mirrors designed to correct aberration, as well as Jones-Bird Newtonian ...

  3. Category : Full-frame mirrorless interchangeable lens cameras

    en.wikipedia.org/wiki/Category:Full-frame_mirror...

    Pages in category "Full-frame mirrorless interchangeable lens cameras" The following 37 pages are in this category, out of 37 total. This list may not reflect recent changes .

  4. Full-frame DSLR - Wikipedia

    en.wikipedia.org/wiki/Full-frame_DSLR

    For example, a 24 mm lens on a camera with a crop factor of 1.5 has a 62° diagonal angle of view, the same as that of a 36 mm lens on a 35 mm film camera. On a full-frame digital camera, the 24 mm lens has the same 84° angle of view as it would on a 35 mm film camera.

  5. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    The optical power of a lens or curved mirror is a physical quantity equal to the reciprocal of the focal length, expressed in metres. A dioptre is its unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dioptre = 1 m −1. For example, a 2-dioptre lens brings parallel rays of light to focus at 1 ⁄ 2 ...

  6. List of lenses for Hasselblad cameras - Wikipedia

    en.wikipedia.org/wiki/List_of_lenses_for...

    This means the crop factor for X system lenses (based on diagonal angle of view) compared to "full-frame" 135 is 0.79; for example, a X system lens with a focal length of 65 mm would have the equivalent coverage of a lens with a focal length of approximately 50 mm on a "full-frame" camera. X system lenses are designed by Hasselblad and ...

  7. Lens speed - Wikipedia

    en.wikipedia.org/wiki/Lens_speed

    The following lenses are no longer in production as of 2021: American Optical 81mm 3.259" f / 0.38 Solid Schmidt Mirror lens (designed for aerial reconnaissance) [11] GOI CV 20mm f / 0.5 Mirror lens (2.9 mm image diameter, 1948; design and glass types used are well documented for anyone wanting to build their own

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