Look up lens in Wiktionary, the free dictionary.
A lens is an optical element which converges or diverges light.
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Lens may also refer to:
A lens is an optical element which converges or diverges light.
Lens may also refer to:
Iris most often refers to:
Artois is a region of northern France. Its territory covers an area of about 4,000 km2 and it has a population of about one million. Its principal cities include Arras, Saint-Omer, Lens, and Béthune. It is the eponym for the term Artesian.
The Pas-de-Calais is a department in north-eastern France named after the French designation of the Strait of Dover, which it borders. It has the most communes of all the departments of France, with 890, and is the 8th most populous. It had a population of 1,465,278 in 2019. The Calais Passage connects to the Port of Calais on the English Channel. The Pas-de-Calais borders the departments of Nord and Somme and is connected to the English county of Kent via the Channel Tunnel.
A camera obscura is the natural phenomenon in which the rays of light passing through a small hole into a dark space form an image where they strike a surface, resulting in an inverted and reversed projection of the view outside.
Nord-Pas-de-Calais ; Picard: Nord-Pas-Calés); is a former administrative region of France. Since 1 January 2016, it has been part of the new region Hauts-de-France. It consisted of the departments of Nord and Pas-de-Calais. Nord-Pas-de-Calais borders the English Channel (west), the North Sea (northwest), Belgium and Picardy (south). Until the 17th century, the history of the North was largely in common with the history of Belgium, that of a land that "for almost a thousand years served as a battlefield for all of Europe." The majority of the region was once part of the historical Southern Netherlands, but gradually became part of France between 1477 and 1678, particularly during the reign of king Louis XIV. The historical French provinces that preceded Nord-Pas-de-Calais are Artois, French Flanders, French Hainaut and (partially) Picardy. These provincial designations are still frequently used by the inhabitants. The former administrative region was created in 1956 under the name "Nord" and maintained that name until 1972 when "Pas-de-Calais" was added. This remained unchanged until its dissolution in 2016.
A camera is an instrument used to capture and store images and videos, either digitally via an electronic image sensor, or chemically via a light-sensitive material such as photographic film. As a pivotal technology in the fields of photography and videography, cameras have played a significant role in the progression of visual arts, media, entertainment, surveillance, and scientific research. The invention of the camera dates back to the 19th century and has since evolved with advancements in technology, leading to a vast array of types and models in the 21st century.
Journey or journeying may refer to:
Lens is a city in the Pas-de-Calais department in northern France. It is one of the main towns of Hauts-de-France along with Lille, Valenciennes, Amiens, Roubaix, Tourcoing, Arras and Douai. The inhabitants are called Lensois.
Estrée or Estrées may refer to:
The arrondissement of Béthune is an arrondissement of France in the Pas-de-Calais department in the Hauts-de-France region. It has 104 communes. Its population is 292,114 (2021), and its area is 707.4 km2 (273.1 sq mi).
The arrondissement of Lens is an arrondissement of northern France in the Pas-de-Calais department in the Hauts-de-France region. It has 50 communes. Its population is 369,427 (2021), and its area is 351.5 km2 (135.7 sq mi).
In photography, a viewfinder is a device on a camera that a photographer uses to determine exactly where the camera is pointed, and approximately how much of that view will be photographed. A viewfinder can be mechanical, with simple optical components, with precision optics and optical functions, or a digital accessory device used with digital cameras.
In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop. The diaphragm is placed in the light path of a lens or objective, and the size of the aperture regulates the amount of light that passes through the lens. The centre of the diaphragm's aperture coincides with the optical axis of the lens system.
A camera is a device to make photographs or movies.
The history of the camera began even before the introduction of photography. Cameras evolved from the camera obscura through many generations of photographic technology – daguerreotypes, calotypes, dry plates, film – to the modern day with digital cameras and camera phones.
An explosive lens—as used, for example, in nuclear weapons—is a highly specialized shaped charge. In general, it is a device composed of several explosive charges. These charges are arranged and formed with the intent to control the shape of the detonation wave passing through them. The explosive lens is conceptually similar to an optical lens, which focuses light waves. The charges that make up the explosive lens are chosen to have different rates of detonation. In order to convert a spherically expanding wavefront into a spherically converging one using only a single boundary between the constituent explosives, the boundary shape must be a paraboloid; similarly, to convert a spherically diverging front into a flat one, the boundary shape must be a hyperboloid, and so on. Several boundaries can be used to reduce aberrations of the final wavefront.
Grenay is a commune in the Pas-de-Calais department in the Hauts-de-France region of France. It is part of the arrondissement of Lens, the canton of Wingles and the Communaupole de Lens-Liévin. Its population was 6,799 in 2019. The current mayor is Christelle Buissette, elected in 2023.
Afocal photography, also called afocal imaging or afocal projection is a method of photography where the camera with its lens attached is mounted over the eyepiece of another image forming system such as an optical telescope or optical microscope, with the camera lens taking the place of the human eye.
The Panasonic Lumix DMC-GH3 is a digital mirrorless interchangeable lens camera (MILC) manufactured by Panasonic. It is the successor to the Panasonic Lumix DMC-GH2 and was announced in September 2012 at photokina. It was available from November 2012.
Kamera may refer to: