Related Words

Focusing: System of moving the lens in relation to the image plane so as to obtain the required degree of sharpness of the film.

Focusing Magnifier: Device to magnify the optical image and aid visual focusing.

Clear-Spot Focusing: Method of lens focusing achieved by examining the image through a transparent area in a specific plane.

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.

Rear Focusing System: System where only the rear lens group moves during focusing. It eliminates changes in the physical length of the lens during focusing.

Zone Focusing: Is a method of focusing the lens so that the depth of field extends over a preselected range of distances.

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

Focusing Hood: Light proof cowl used on tlr and most roll film slr cameras to prevent extraneous light falling on the focusing screen.

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

Focusing Scale: Scale of distances marked on a lens focusing ring.