Parallax is a displacement or difference in the apparent position 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.
A Digital single-lens reflex cameras digital cameras combining the parts of a single-lens reflex camera (SLR) and a digital camera back, replacing the photographic film.
A pellicle mirror is an ultra-thin, ultra-lightweight semi-transparent mirror employed in the light path of an optical instrument, splitting the light beam into two separate beams, both of reduced light intensity.
A pentaprism is a five-sided reflecting prism used to deviate a beam of light by a constant 90°, even if the entry beam is not at 90° to the prism.
aperture- the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane.
shutter- is 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.
exposure-is the amount of light allowed to fall on each area unit of a photographic medium (photographic film or image sensor) during the process of taking a photograph.
depth of field-is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image.
F-stop - number is a ratio of the focal length of the lens to the diameter of the aperture.
focal length- an optical system is a measure of how strongly the system converges or diverges light.
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