apreture/ f-stop- the aperture of a lens is the diameter of the lens opening which determines the amount of light that enters the camera. Aperture is expressed as an f-stop. The aperture size is related to the focal length of the lens. An aperture diameter of 50mm on a 100mm lens results in a aperture size of 1/2 (50 divded by 100). The aperture size is represented as a fraction, f/2, F2, or f:1.2, and is referred to as an f-stop or f-number.
apreture priority-a shooting mode on a camera where the photographer is able to choose which aperture is used. The camera automatically selects the shutter speed to determine the correct exposure. Selecting the aperture is useful when the photographer wants to control the depth of field.
ambient light-The soft indirect light that fills the volume of a room with illumination. It softens shadows on people's faces and creates an inviting glow in the room.
depth of field-the depth of field (DOF) is the area in front and behind the main focus area that is also in focus.
artifical light- man made lighting i.e, the flash light on your iphone.
ASA/ISO/film speed-Film speed refers to the sensitivity of film to light. Film sensitivity is measured by a set of standards established by the American Standards Association (ASA) and the International Standards Organization (ISO). For all practical purposes, these ASA and ISO numbers are interchangeable. In general, films with a higher sensitivity (larger number) have coarser grain and do not register detail as well as films with lower sensitivity (lower number). Slower film speeds equate to better detail and sharpness in your photographs, and need to be exposed for longer than faster film speeds.
bracket- taking several photos of the same thing with the same setting or background.
depth of field- the back ground in a picture,. (range of difference.)
how to control depth of field- use the f-stops.
light meter- reacts to light in a photo and measures it.
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