Shutter Speed

In photography, shutter speed or exposure time is the length of time a camera's shutter is open when taking a photograph. The amount of light that reaches the film or image sensor is proportional to the exposure time. 

An example of how shutter speed effects the image

In the early days of photography, available shutter speeds were not standardised. A typical sequence may have been 1/10s, 1/25s, 1/50s, 1/100s, 1/200s and 1/500s. Following the adaptation of a standardised way of representing aperture so that each major step doubled or halved the amount of light entering the camera. A standardised 2:1 scale was adopted for shutter speed so that opening one aperture stop and reducing the shutter speed by one step resulted in the identical exposure. 


Cheerio. :o)

- Olivia.