Shutter: a movable cover, slide for an opening
Exposure: the act of exposing
Depth of Field: the range of distances along the axis of an optical instrument, usually a camera lens, through which an object will produce a relatively distinct image.
F-Stop: the setting of an adjustable lens aperture, as indicated by an f number.
Focal Length: the distance from a focal point of a lens or mirror to the corresponding principal plane.
Pellicle: a thin, partially reflective coating, as on a beam splitter.
Dark Room: a room in which film or the like is made, handled, or developed and from which the actinic rays of light are excluded.
Range Finder: any of various instruments for determining the distance from the observer to a particular object, as for sighting a gun or adjusting the focus of a camera.
Focal Plane: a plane through a focal point and normal to the axis of a lens, mirror, or other optical system.
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