Home » The A-Z of photography: F Definitions of photography terms beginning with F F (mount) FA F&R aspherical FC Advertisement FE (focal clutch mechanism) FE (Canon fisheye) FEC FHB Fill factor Fill-in flash Advertisement Firmware First-curtain sync Fisheye lens Flare Flash compensation Flash gun Advertisement Flash memory Floating system (lenses) FLD Flourite Focal length Focus lock Advertisement Formatting Foveon system Frame rate FTM A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z