shutter- a mechanical device for opening and closing the aperture of a camera lens to expose film or the like.
exposure-photographic film or plate when is exposed
depth of field- a camera lens which an object will produce a relatively distinct image.
F-stop-any of the settings for the f-number of the camera
focal length-the distance from a focal point of a lens to the corresponding plane.
parallax-is a displacement or difference in the apparent position of an object
Pentaprism- is a five-sided reflecting prism used to deviate a beam of light
pentax- is a brand name used by Pentax Ricoh Imaging Company for cameras
pellicle mirror-transparent mirror employed in the light path of an optical instrument
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