spot — [ spɔt ] n. m. et adj. inv. • 1889; mot angl. « tache, point » ♦ Anglic. I ♦ N. m. 1 ♦ Phys. Point lumineux réfléchi par le miroir de certains instruments de mesure (galvanomètre, etc.) qui se déplace le long d une échelle graduée. ♢ Tache… … Encyclopédie Universelle
Optimum HDTV viewing distance — is the distance that provides the viewer with the optimum immersive visual HDTV experience. Although opinions vary on the exact screen size to distance relationship, formal research and recommendations suggest closer is preferred to further[not… … Wikipedia
Hyperfocal distance — In optics and photography, hyperfocal distance is a distance beyond which all objects can be brought into an acceptable focus. There are two commonly used definitions of hyperfocal distance , leading to values that differ only slightly:The first… … Wikipedia
Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… … Wikipedia
Flange focal distance — The flange focal distance (FFD) (also known as the flange to film distance, flange focal depth, flange back distance (FBD), or register, depending on the usage and source) of a lens mount for an interchangeable lens camera system is one of its… … Wikipedia
Depth of field — The area within the depth of field appears sharp, while the areas in front of and beyond the depth of field appear blurry … Wikipedia
Diffraction topography — (short: topography ) is an X ray imaging technique based on Bragg diffraction. Diffraction topographic images ( topographs ) record the intensity profile of a beam of X rays (or, sometimes, neutrons) diffracted by a crystal. A topograph thus… … Wikipedia
Satellite artificiel — Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en orbite géostationnaire … Wikipédia en Français
Satellite d'astronomie — Satellite artificiel Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en … Wikipédia en Français
Satellite scientifique — Satellite artificiel Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en … Wikipédia en Français
Satellites artificiels — Satellite artificiel Pour les articles homonymes, voir satellite et Sat. Le satellite de météorologie GOES O avant son lancement en … Wikipédia en Français