Unit 57 discusses various photographic terminology including: Shutter speed which controls the brightness and movement in images. ISO which changes the light sensitivity of images. Aperture and depth of field which determine the distance of sharp focus. Automatic and manual exposures which control how the camera exposes images. Colour balance adjusts hues. Composition sets the framing. The rule of thirds positions subjects. Complementary colours contrast foreground and background. Analogous colours group similar hues. And macro photography provides close-up shots.