focal stop

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• FOCAL-69 — was the landmark version of the FOCAL programming language, more widely publicized than the original version of the language created in 1968. FOCAL 69, created by Richard Merrill is important because: * It was the basis for all later derivatives… …   Wikipedia

• focal plane —    In photography, an image line at right angle to the optical axis passing through the focal point. This forms the plane of sharp focus when a camera is set on infinity. Also see aperture, camera, focal length, and f/stop …   Glossary of Art Terms

• focal length —    In photography, the distance between the lens (its rear nodal point) and the focal plane (the film s or paper s surface). Also see aperture, camera, f/stop, telephoto, and wide angle …   Glossary of Art Terms

• focal ratio — noun the ratio of the focal length to the diameter of a (camera) lens system • Syn: ↑f number, ↑stop number, ↑speed • Hypernyms: ↑ratio * * * noun : f number …   Useful english dictionary

• stop number — noun the ratio of the focal length to the diameter of a (camera) lens system • Syn: ↑focal ratio, ↑f number, ↑speed • Hypernyms: ↑ratio * * * f number …   Useful english dictionary

• f-stop — ˈ ̷ ̷ˌ ̷ ̷ noun Etymology: f (symbol for focal length) : a camera lens aperture setting indicated by an f number * * * /ef stop /, n. Photog. the setting of an adjustable lens aperture, as indicated by an f number. Also, f stop. * * * fˈ stop… …   Useful english dictionary

• F-Stop — WikiV (F Stop also known as f number or f system) The speed or ability of a lens to pass light. It is calculated by dividing the focal length of the lens by its diameter. The f stop also is a factor in more areas of focus in the image known as… …   Audio and video glossary

• f/stop —    In photography, the focal length of a camera divided by the diameter of its aperture. Knowing the f/stop, a lightmeter can measure the light on the subject, and calculate the exposure time …   Glossary of Art Terms

• f-stop — F/A/V the ratio of focal length to the effective diameter of a lens; also called f number, it represents how much light is able to pass through the lens. TV Numbers corresponding to variable size of a camera s iris opening, and thus the amount of …   Audio and video glossary

• F-number — In optics, the f number (sometimes called focal ratio, f ratio, or relative aperture [Smith, Warren Modern Lens Design 2005 McGraw Hill] ) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; …   Wikipedia

• Optical aberration — v · d · e Optical aberration …   Wikipedia