| F stop: |
Number that equals the focal length of the lens divided by the diameter of the aperture. |
| Fast film: |
Film which has an emulsion that is very sensitive to light. These films have high ISO ratings. |
| Fast lens: |
Lens with a wide maximum aperture (low f-stop number). |
| Fill light: |
Source of illumination that lightens shadows. |
| Film: |
A photographic emulsion coated on a flexible, transparent base that records images or scenes. Film is produced as positive (slide) or negative stock in various size and light sensitivity formats
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| Film speed: |
Sensitivity of a photographic emulsion to light. Films are given ISO or DIN numbers denoting speed characteristics. |
| Filters: |
Colored glass, gelatin or plastic disks, which modify the light passing through them, mainly in terms of color content. They can be used at the camera or printing stages. |
| Final approach.: |
The part of a landing sequence or aerodrome circuit procedure in which the aircraft has made its final turn and is inbound to the active runway. Downwind is the segment of the circuit paralleling the runway and flown on a reciprocal heading. Base leg is t |
| FireWire: |
A type of cabling technology for transferring data to and from digital devices at high speed. Some professional digital cameras and memory card readers connect to the computer over FireWire. FireWire card readers are typically faster than those that conne |
| Fisheye lens: |
Ultra-wide angle lens giving 180 angle of view that produces a circular image on 35 mm, 5-9 mm lenses showing whole image, 15-17 mm lenses giving a rectangular image fitting just inside the circle, thus representing 180 across the diagonal.
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| Flameout: |
A combustion failure in a turbine engine(jet) resulting in power loss. |
| Flaps: |
Moveable parts of the trailing edge of a wing that are used to increase lift at slower air speeds. Flaps increase lift by changing the shape of the airfoil. A pilot will extend the flaps when the airplane is landing. By extending the flaps, the pilot is i |
| Flare: |
The point during the landing approach in which the pilot gives an increased amount of up elevator to smooth the touchdown of the airplane. Ground effect may result in the aircraft remaining airborne for longer than expected. The same principal applies to |
| Flash: |
Artificial light source giving brief but very bright illumination. It is produced by a combination of certain gases within a transparent tube. There are two types; electronic, which may be used repeatedly, and expendable in which the bulb can be used only |
| Flash memory: |
A form of memory using chips instead of magnetic media. The data in the device isn't lost when the power is turned off. |
| Flash memory card: |
A card containing chips that store images. |
| Flat light: |
Light that produces very little contrast or modeling on the subject and a minimum of shadows. |
| Flight characteristics: |
In aviation, a distinguishing feature of a flight vehicle relating to its predisposition to stall or yaw, or its ability to remain stable or controllable at a given speed |
| Flight computer: |
A manual slide rule or electronic calculator used to determine wind correction, fuel consumption, airspeed, and other performance calculations during flight planning. |
| Flight log: |
A flight planning document in which a pilot calculates factors such as speed, course, altitude, and fuel consumption for an upcoming flight. |
| Flight path: |
Path taken in the air by an aircraft or any flying object whilst airbourne
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| Flight plan: |
A pilot's intended routing and schedule for a flight, giving the pilot and aircraft identification; course, speed, and altitude to be flown; and estimated times of arrival at intermediate stops and the destination; submitted, orally or in writing, to air |
| Flight profile: |
The phases of a typical flight that usually consists of the following: preflight, takeoff, departure, en route, descent, approach and landing. |
| Flight time: |
The time from the moment an aircraft first moves under its own power for the purpose of flight until the moment it comes to rest at the next point of landing. |
| Focal length: |
Describes the distance between the film and the optical center of the lens when the lens is focused on infinity.
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| Focal point: |
Point of light on the optical axis where all rays of light from a given subject meet at a common point of sharp focus. |
| Focus: |
The adjustment of the distance setting on a lens to define the required subject or scene sharply.
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| Fog: |
Water that has condensed close to ground level, producing a cloud of very small droplets that reduces visibility to less than one km (three thousand and three hundred feet).
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| Forecasts: |
A statement of expected future occurrences. Weather forecasting includes the use of objective models based on certain atmospheric parameters, along with the skill and experience of a meteorologist. |
| Foreground: |
The area in an image, closer than the main subject. |
| Format: |
Describes the actual size of the photograph, either slide or negative, produced by a particular camera. Common sizes are 35mm, medium and/or large format
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| Foxtrot: |
Stands for the letter F in the phonetic alphabet. |
| Frames per second: |
Used to describe how many frames can a motor drive or winder handle automatically. |
| Frequency: |
The number of periodic oscillation, vibrations or waves per unit of time; usually expressed in hertz. |
| Front: |
A weather term determining the boundary between two different air masses. |
| Fuselage: |
The body of an aeroplane or helicopter. |
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