These are the words I think are important:
parallax:The displacement of an observed object due to the change in the position of the observer.
Didgital:Displaying a readout in digital form.
mirror:A reflecting surface
Eyepiece: The lens which the eye views the image formed by the objective lens or lenses.
Definition:
Aperture: An opening
Shutter: A movable cover for a window
Exposure: When something os exposed
Depth of field: The range of distances along the axis of an optical instrument
F-stop: The setting of an adjustable lens aperture
Focal length: Distance from the focal point to the corresponding principal plane.
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