Week 9- Shutter Speed

 Shutter Speed is one of the most basic important controls on a camera. Shutter speed controls the amount of time that your film, or digital sensor, is exposed to light. In effect, the shutter determines what image is captured on your film. The shutter is a small plastic sheet that opens and closes to allow light onto the film or prevent light from reaching the film. The shutter is opened when you press the shutter release button on your camera to take a picture. The shutter speed determines how long the shutter remains open. Note that the minimum hand held speed should never be below 1/60th of a second without image stabilization assistance from your camera or lens.

 ISO denotes how sensitive the image sensor is to the amount of light present. The higher the ISO, the more sensitive the image sensor and therefore the possibility to take pictures in low-light situations. ISO speed affects the shutter speed / aperture combinations you can use to obtain correct exposure.

When you boost the sensitivity of your image sensor by selecting a higher ISO, the image sensor is now able to record a fainter light signal. However, it is also true now that it will record fainter noise, where noise is any signal that is not attributed to the light from your subject.

Exposure, in photographic terms, is the process of capturing light with your camera to produce an image on film or a digital sensor. (Film and digital sensors will be referred to as film throughout this document unless specifically noted otherwise.) Your camera mechanically controls the incoming light and directs it to the film. The film is sensitive to the light and is exposed.