Rangefinder- allows the photographer to measure the subject distance and take photographs that are in sharp focus
Parallax- causes framing errors in close-up shots; is an apparent displacement or difference of orientation of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines
Aperture- a hole or an opening through which light travels
Viewfinder- what the photographer looks through to compose, and in many cases to focus, the picture
Shutter- a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film or a light-sensitive electronic sensor to light to capture a permanent image of a scene
Autofocus- a feature of some optical systems that allows them to obtain (and in some systems to also continuously maintain) correct focus on a subject, instead of requiring the operator to adjust focus manually.
Depth of Field- the portion of a scene that appears sharp in the image
Exposure- the total amount of light allowed to fall on the sensor during the taking of a photograph
F-stop- is the focal length divided by the "effective" aperture diameter
Focal length- a measure of how strongly it converges (focuses) or diverges (defocuses) light
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