Definition of Photography

‘The process, activity and art of creating still or moving pictures by recording radiation on a sensitive medium, such as a photographic film, or an electric sensor. Light patterns reflected or emitted objects active a sensitive chemical or electronic sensor during a timed exposure, usually through a photographic lens in a device known as a camera that also stored the resulting information chemically or electronically.’

Photography has many uses for business, science, art and pleasure.

Genres:
Aerial, black and white, commercial, documentary, fashion, fine art, forensic, glamour, high speed, nature, photojournalism, portrait, senior, still life, street, underwater, wedding, wildlife

Camera:
A device that records images, either as still photographs or as moving images known as videos or movies. The term comes from the camera obscura (Latin for 'darie chambe') an early mechanism of projecting images where an entire room functioned as a real time imaging system: the modern camera evolved from the camera obscura

Shutter:
A device that allows light to pass for a determinder 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.

B; bulb > seconds > half second etc.

B 1 2 4 8 15 30 60 125 250 500 1000

Aperture:
In optics, an aperture is a hole through which light travels. This can be measured in increments called f-stops. Smaller the number the bigger the aperture

Lens:
Captures the light from the subject and brings it to focus on the film or detector

Exposure Control:
The size of the aperture and the brightness of the scene controls the amount of light that enters the camera during a period of time, and the shutter controls the length of time that the light hits therecording surface. Equivalent exposures can be with a larger aperture and a faster shutter speed or a corresponding smaller aperture and with the shutter speed slowed down