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  2. Abbe number - Wikipedia

    en.wikipedia.org/wiki/Abbe_number

    Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...

  3. List of Canon products - Wikipedia

    en.wikipedia.org/wiki/List_of_Canon_products

    See Canon EF lenses for the product line-up. See Canon EF-S lenses for the product line-up. EF-S lenses are built for APS-C 1.6x crop sensors, so they only work with models that use this sensor size. When EF-S lenses are used on a 35mm (full frame) camera the back element will hit the mirror assembly or cause substantial vignetting since the ...

  4. Canon EF 14mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_14mm_lens

    The Canon EF 14mm f/2.8L USM is an ultra wide angle prime lens. It is the widest prime lens in the Canon EF series. Because it is corrected for a rectilinear projection, the field of view is less than that of the Canon 15mm fisheye . The front element of the lens is so prominent that it does not allow use of filters on the front.

  5. Canon EOS M - Wikipedia

    en.wikipedia.org/wiki/Canon_EOS_M

    Made in. Japan. Canon EOS M is the first mirrorless interchangeable-lens camera produced by Canon . DPReview noted that the EOS M is effectively a miniature version of the Canon EOS 650D, which was introduced in June 2012, with a simpler physical interface. [ 1] The letter M in EOS M stands for "mobility" and EOS means "electro-optical system".

  6. Abbe sine condition - Wikipedia

    en.wikipedia.org/wiki/Abbe_sine_condition

    In optics, the Abbe sine condition is a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects. It was formulated by Ernst Abbe in the context of microscopes. [ 1] The Abbe sine condition says that. the sine of the object-space angle should be ...

  7. Canon EOS 400D - Wikipedia

    en.wikipedia.org/wiki/Canon_EOS_400D

    It is the successor of the Canon EOS 350D, and upgrades to a 10.1 megapixel CMOS sensor, a larger continuous shooting buffer, an integrated image sensor vibrating cleaning system (first used in a Canon EOS DSLR), a more precise nine-point autofocus system from the EOS 30D, improved grip, and a bigger 2.5-inch (64 mm) LCD with 230,000 pixels and a larger viewing angle which replaces the top ...

  8. James Abbe - Wikipedia

    en.wikipedia.org/wiki/James_Abbe

    James Edward Abbe was born in 1883 in Alfred, Maine. His career as an international photographer was first boosted by The Washington Post, which commissioned him to travel and take photographs of a 16-day voyage with the American battleship fleet to England and France in 1910. Many years later he traveled throughout Europe as a young ...

  9. Canon EF portrait lenses - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_Portrait_Lenses

    Canon EF 85mm f/1.8 USM, a classic portrait lens. Canon makes several lenses for the EF lens mount and EF-S lens mount that are well-suited for portrait photography.These lenses may also be used for other purposes, often being suited for indoor sports photography as well, due to suitable focal length and wide aperture, though autofocus speed is an issue in sports photography that is less ...

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