Single-lens Reflex Camera

Single-lens reflex camera : a camera that typically uses a semi-automatic moving mirror system that permits the photographer to see exactly what will be captured by the film or digital imaging system

Leaf Shutters:  the shutter is constructed of diaphragm-like blades and can be situated either between the lens or behind the lens

Parallax: is an apparent 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 

Shutter: is a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film r a light-sensitive electronic sensor to light to capture a permanent image of a scene.

Aperture: is a hole or an opening through which light travels
Shutter:  is a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film r a light-sensitive electronic sensor to light to capture a permanent image of a scene.
Exposure: is the total amount of light allowed to fall on the photographic medium during the process of taking a photograph
Depth of field: is the portion of a scene that appears acceptably sharp in the image
F-stop: A measure of the size of the opening in a lens calibratred to a corresponding focal length.
Focal length: The focal length of a lens is defined as the distance in mm from the optical center of the lens to the focal point, which is located on the sensor or film if the subject is "in focus".