Focal lengthPhotographyDistance in millimeters from the lens optical center to the sensor; determines angle of view and magnification.Learn about this termUnit 02: camera anatomyPhotographyRelated TermsWide-angle lensA lens with a short focal length (typically 10-35mm on full-...Telephoto lensA lens with a long focal length (typically 70mm and above) t...Prime lensA lens with a fixed focal length, often with wider maximum a...