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  2. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    Stepwise magnification by 6% per frame into a 39-megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea. Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a size ratio called optical magnification.

  3. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    The camera equation, or G#, is the ratio of the radiance reaching the camera sensor to the irradiance on the focal plane of the camera lens: [19] # = +, where τ is the transmission coefficient of the lens, and the units are in inverse steradians (sr −1).

  4. Camera lens - Wikipedia

    en.wikipedia.org/wiki/Camera_lens

    Different kinds of camera lenses, including wide angle, telephoto and speciality. A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses (compound lens) used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.

  5. Close-up lens - Wikipedia

    en.wikipedia.org/wiki/Close-up_lens

    That distance is sometimes given on the filter in millimeters. A +3 close-up lens has a maximal working distance of 0.333 m or 333 mm. The magnification is the focal distance of the objective lens (f) divided by the focal distance of the close-up lens; i.e., the focal distance of the objective lens (in meters) multiplied by the diopter value (D) of the close-up lens:

  6. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    A lens with a focal length shorter than normal is often referred to as a wide-angle lens (typically 35 mm and less, for 35 mm-format cameras), while a lens significantly longer than normal may be referred to as a telephoto lens (typically 85 mm and more, for 35 mm-format cameras). Technically, long focal length lenses are only "telephoto" if ...

  7. Photographic lens design - Wikipedia

    en.wikipedia.org/wiki/Photographic_lens_design

    Prime lens - a photographic lens whose focal length is fixed, as opposed to a zoom lens, or that is the primary lens in a combination lens system. Zoom lenses - variable focal length lenses. Zoom lenses cover a range of focal lengths by utilising movable elements within the barrel of the lens assembly.

  8. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    This magnification formula provides two easy ways to distinguish converging (f > 0) and diverging (f < 0) lenses: For an object very close to the lens (0 < S 1 < | f |), a converging lens would form a magnified (bigger) virtual image, whereas a diverging lens would form a demagnified (smaller) image; For an object very far from the lens (S 1 ...

  9. List of optics equations - Wikipedia

    en.wikipedia.org/wiki/List_of_optics_equations

    Defining equation SI units Dimension Lens power P = / m −1 = D (dioptre) [L] −1: Lateral magnification m = / = / dimensionless dimensionless Angular magnification m = / dimensionless dimensionless

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