Pentaprism- 5 sided mirror that redirect light from lens to viewfinder in a camera in a 90 degree angle.
Viewfinder- what the photographer looks through to compose, and in many cases to focus, the picture.
Leaf shutter- a type of camera shutter consisting of a mechanism with one or more pivoting metal leaves that would not allow light through the lens onto the film, and when triggered, the shutter opens by moving the leaves to uncover the lens for the required time to make an exposure, then shuts.
Aperture- a hole or an opening through where light travels. shutter-device allowing light to pass in a period of time, exposing the photographic film to capture a photo.
Exposure- total density of light allowed to fall on photographic medium during photography.
Depth of field- distance between nearest and farthest object captured in camera where they are sharply focused on.
F-stop- a dimensionless number that measures the lens speed, expressing the diameter of entrance pupil
Focal length- the distance where initially collimated rays are brought to a focus, measured the strength of light converging or diverging.
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