From our birth to death there were beautiful memories in everyone’s life. At one point all of us will remind that beautiful memories and often it will bring a smile or on make us cry. All of us wants to keep that beautiful moments till our death and even after our death for our upcoming generation who will know how we had lived our life.
Perhaps we can’t rewind our life but thanks to technology for inventing a technic to keep our memories alive through photos. From olden days to today photos have gained special place in everyone’s life. The photos are true proofs that how our personality, and lifestyle changes.
Olden days black and white photos were popular in many houses and such photos which were printed and now kept in album speaks of many beautiful memories of our parents.
Today with the advent of technology, the way of clicking photos and saving it etc. changed. Earlier only through cameras photos were taken but today mobile phones have become mini cameras. Yet cameras have special place. But have you ever wondered about the technology behind these cameras?
Yes, a technology called ‘Shutter’ is behind our photographs. Shutter, in photography, is a device through which the lens aperture of a camera is opened to admit light and thus expose the film.
Behind-the-lens shutters were used in some cameras with limited lens interchangeability. Shutters in front of the lens, sometimes simply a lens cap that is removed and replaced for the long exposures required, were used in the early days of photography.
Adjustable shutters control exposure time, or the length of time during which light is admitted. Optimum exposure time varies according to lighting conditions, movement of the subject, and other factors, and it may be either selected in advance by the photographer or, in the case of automatic cameras, set by the camera itself on a signal from a built-in exposure-metering system. The mechanical shutter can usually be set only for indicated speeds throughout its range; some electronic shutters have a continuous operating range.
Modern camera shutters are of two principal types. The leaf shutter, positioned between or just behind the lens components, consists of a number of overlapping metal blades opened and closed either by spring action or electronically.
Most digital cameras also employ mechanical shutters, though some, especially small “point and shoot” cameras and cell-phone cameras, use electronic “shutters” that briefly turn off the light-reading capability of the image sensor so that the captured image can be stored and the sensor cleared for the next exposure
Most shutters have a flash synchronisation switch to trigger a flash, if connected. This was quite a complicated matter with mechanical shutters and flashbulbs which took an appreciable time to reach full brightness, focal-plane shutters making this even more difficult.
Cinematography uses a rotary disc shutter in movie cameras, a continuously spinning disc which conceals the image with a reflex mirror during the intermittent motion between frame exposure. The disc then spins to an open section that exposes the next frame of film while it is held by the registration pin.