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- F Mount
- The F Mount is the designation given to the Nikon single lens reflex interchangeable lens mounting system introduced with the Nikon F in June, 1959.
- Fast Glass
- Slang term, often used by professional photographers, for a fast lens.
- Fast Lens
- A lens with a large maximum aperture, usually in the range of f/2.8 or larger. Because such a lens will allow more light to reach the film or image sensor, it will allow the use of faster shutter speeds.
- File Format
- A selected program type or data file such as JPEG, NEF, RAW or TIFF.
- File
- A computer document; also, a collection of information, such as data, images or text that can be saved on a disk or a hard drive.
- Fill-Flash
- A technique that uses flash illumination as a supplement to ambient light. Useful when photographing subjects that are backlit with very high-contrast lighting or in shadow.
- Filter Adapter Ring
- Placed between a filter and the lens when attachment size differs.
- Filter
- A plastic or glass lens that fits in front of the camera lens and is used to manipulate or affect the final image.
- FireWire
- A protocol for transferring data to and from digital devices at high speed, often up to 400 megabytes per second.
- Fisheye Lens
- A lens that has a picture angle of approximately 180 degrees or more.
- Fixed Focus
- Refers to a lens in which the focus is fixed at the time of manufacture and is not adjustable. These lenses are most often used in single-use cameras. They are also found in phone cameras and webcams.
- Flare
- The soft effect visible in a picture resulting from stray light passing through the lens that is not focused to form the primary image. Flare can be controlled by using optical coating, light baffles, low reflection surfaces or a lens hood.
- Flash Card
- A type of camera memory card that can retain data after the system has been turned off.
- Flash Duration
- Refers to the very short amount of time it usually takes for a flash to fire. Automatic flash control varies the brightness by varying the duration of the flash. Flash duration for an auto flash is typically 1/1000 to 1/20,000 second.
- Flash Exposure Bracketing
- A feature that enables you to automatically bracket exposures at varied flash outputs without changing the shutter speed and/or aperture.
- Flash Memory
- A type of memory chip that can retain data after the system has been shut down.
- Flash Output Level Compensation
- A control used to adjust an automatic TTL flash unit’s operation, enabling an increase or decrease of flash output to lighten or darken the flash effect.
- Flash Shooting Distance Range
- The distance over which a flash can effectively provide light.
- Flash Sync Speed
- The speed at which a flash synchronizes with the opening of the shutter.
- Flash
- An electronic unit that provides a relatively brief burst of light.
- Flat Lighting
- Lighting source or method that produces a low contrast image or depicts a subject with little dimensionality.
- Flat
- A term often used to indicate an image that's too low in contrast; a "flat" image.
- Flexible Program
- See Program Shift.
- Flood Lamp
- A type of photo reflector lamp that can illuminate a rather wide area.
- Floppy Disk
- A flexible, thin, 3.5-inch square plastic disk used to store data or images. Not widely used anymore as their storage capacity is limited.
- Fluorescent
- The illumination produced from a gas-discharge lamp or tube is called fluorescent light. Find out more.
- f/number or f/stop
- The numerical expression of the relative aperture of a lens. Each f/number is 1.4 times larger than the preceding one, and each number indicates a halving or doubling of the amount of light allowed to pass through the lens.
- Focal Length
- The distance from the principal point to the focal point.
- Focal Point
- A point on the optical axis where light rays converge to form a sharp image of an object.
- Focus Mode
- A method of operation for an autofocus system. Basic focus modes include single servo AF, continuous servo AF and manual focus.
- Focus-Priority AF
- An autofocus mode in which the shutter cannot be released until the subject is in focus.
- Focus Range
- The range within which a lens can focus on a selected subject. Often used to indicate the capability of a macro or micro lens.
- Focus Tracking
- A focusing system that analyzes a moving subject’s speed and anticipates the position of the subject at the exact moment of exposure. Enables you to take in-focus pictures of moving subjects.
- Foreground
- The area in a scene that is closer to the photographer than the main subject.
- FP High-Speed Sync
- A feature of flash units and SLR cameras that enables flash pictures to be taken at shutter speeds higher than the camera's normally synchronized speeds.
- FPS
- Frames per second. Refers to the rate at which film is exposed when a camera's motor drive is engaged; in digital photography, the rate at which image frames are exposed.
- Frame
- A single image; also, the scene viewed through the camera's finder.
- Front-Curtain Sync
- A technique in which the flash fires an instant after the first (front) curtain of a focal plane shutter has completed its travel across the film plane. See also Rear-Curtain Sync.
- Front Lighting
- Lighting that illuminates the subject from the position of the camera. Because illumination falls evenly on the subject, a front-lit subject may look flat and less dimensional.
- Full-Aperture Metering
- A metering method in which light is measured with the lens at maximum aperture.
- FX Format
- Refers to Nikon cameras that feature a film-frame size (23.9x36mm) sensor.