fanny pack: A small bag worn around the waist like a belt.

fastening point: A position, represented by a square, where an image-editing program anchors a magnetic selection outline.

feather: To fade the borders of an image element so that it blends more smoothly with another layer.

file format: A way of storing image data in a file.

fill flash: Also called forced flash. A camera setting that causes the electronic flash to always fire, which produces the effect of filling in shadows in brightly illuminated images.

filter: In photography, a device that fits over the lens, changing the light in some way. In image editing, a feature that changes the pixels in an image to produce blurring, sharpening, and other special effects.

flash: A device on your camera that fires a burst of light when you take a picture to illuminate your subject.

flash bracketing: Capturing a series of photos, each with a different exposure, by pressing the camera’s shutter button once.

focal length: The distance between the film and the optical center of the lens when the lens is focused on infinity, usually measured in millimeters.

focus: To adjust the lens to produce a sharp image.

framing: In photography, composing your image in the viewfinder. In composition, using elements of an image to form a sort of picture frame around an important subject.

front curtain sync: The default kind of electronic flash synchronization technique. The flash fires at the beginning of the exposure — in the instant that the first curtain of the focal plane shutter finishes its movement across the film or sensor plane.

f-stop: Refers to the size of the camera aperture. A higher number indicates a smaller aperture. Written as f/2, f/8, and so on.

FTP: File Transfer Protocol. A set of communication rules that allow data or files to be transferred between computers over a network.