Primary data can be collected in several ways. installing cameras in a retail store to unobtrusively record shopping behavior is an example of observational research.
A camera is an optical device that captures visual images. Basically, a camera is a sealed box with tiny holes that let light pass through and capture an image on a photosensitive surface. Cameras have various mechanisms that control how light hits the photosensitive surface.
camera, in photography, a device that records an image of an object on a light-sensitive surface. It is essentially a blackout box with an opening to let in focused light onto an intensified film or plate. 35mm single-lens reflex (SLR) camera.
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