Related Words

Focus (Earthquake): The point at which the rupture occurs: synonymous with hypocenter.

Manual Focus: Manual Focus mode allows a user to manual control the lenses and set the distance to the subject. It is mainly designed for users who need to shoot in low light conditions, or use macro or s . . . View Full Definition

Preset Focus Shooting: Technique in which focus is set at a predetermined setting and the shutter is released when the subject moves into the focus point.

Press Focus Lever: Lever found on the between-lens shutter of many large format cameras. It allows the shutter blades to be held open for lens focusing no matter what shutter speed has been set.

Long Focus: A lens in which the focal length is much greater than the diagonal of the film format with which it is used.

Infrared Focus: See ir setting.

Focusing Screen: Ground glass screen fixed to the camera at the image-forming plane, enabling the image to be viewed and focused.

Front Element Focusing: System of lens focusing in which only the front component of a compound lens moves backward and forward to adjust focus.

IF (Internal Focusing): System in which only the internal lens group shifts during focusing. If benefits include focusing without changing the physical length of a lens body, faster focusing, reduced diameter of th . . . View Full Definition

Rack And Pinion Focusing: Mechanical focusing system used on copying or monorail cameras. A pinion engages a rack on a slide. Focusing is achieved by turning a knob or wheel, which moves the lens or image panel.