Technology / Television (TV) / Focal Length: The distance from the lens' optical center to its focal point, usually measured in millimeters. There are three conventional types of focal length: wide angle, normal, and telephoto.
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Focal Noun Synonyms: central, focused, concentrated, convergent, centred, centralized
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Length Verb Synonyms: extent, measure, span, reach, size, magnitude, dimension, measurement
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Entertainment / Photography / Equivalent Focal Length: Distance in a lens between the front nodal point and the focal plane when the lens is set to focus a subject at infinity. In a telephoto lens the equivalent focal length is shorter than the back focus MORE
Entertainment / Photography / Afocal Lens: Lens attachment that alters the focal length of the camera lens without disturbing the distance between the lens and the film plane. MORE
Entertainment / Photography / Fixed Focal Length: Camera system whose lens cannot be interchanged for a lens of different focal length. MORE
Technology / Television (TV) / Zoom Lens (Variable Focal Length): A lens with a variable focal length, allowing the operator to shift immediately and continuously from wide angle to telephoto (or vice versa) without switching lenses. MORE
Entertainment / Photography / Focal Plane Shutter: Shutter which lies just in front of the focal plane. Light sensitive film positioned at the focal plane is progressively exposed as the shutter blinds move across it. MORE
Science / Astrology / Focal Point: Any point in a horoscope where several influences converge or disperse, such as the position of the squared planet in a T-square formation, the action point in a yod, the handle of a bucket, etc. See MORE