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Shutter speed can be defined as a length of time required for a shutter to be opened; in this the total exposure is directly proportional to the interval of light reaching images or film sensor. The shutter speed can also be defined as the amount of time the shutter is kept opened.The upper diaphragm of a lens big or small values and timing of the shutter curtain. These two perform the work of regulating the light entered in to the camera and exposed.
How to Measure the Shutter Speed?
The measurement of shutter speed is done in seconds. The photograph which is taken in daylight is 1/125th of 1 second. The way the movement appeared in the picture is changed by shutter speed.
To freeze fast moving object short shutter speed is used, for example at sporting events.
To blur a fast moving object for artistic effects very long shutter speed is used.
Camera shutters also include two other settings for long exposures that is:
- B for bulb - As long as the shutter release is held it keeps the shutter opened.
- T for time - Until the shutter release is pressed again it keeps the shutter opened.
To short exposures time the term "speed" is referred to as fast, and slow for long exposure times. Reciprocal time is often designated for shutter speeds, for example 60 for 1/60 s.
- Very slow shutter speed is given to very few cameras that are measured in seconds but not in fractions of seconds like a second, 10 seconds, 30 seconds etc.
- The option to shoot in B or BULB mode. The shutter is opened for as ling as you hold down this mode.
Factors that affect the total exposure of a photograph /shutter speed:
1) The scene luminance.
2) The aperture size (f-number),
A fast shutter speed requires a larger aperture (smaller f- number), for any given total exposure.
A longer length of time can be compensated by small aperture (larger f- number) for a low shutter speed
Different kinds of work performed by shutter speeds
Different selection of shutter speeds will give you different kind of visual effect on a final photograph.
Actions can be freeze by using fast shutter speed, whereas images can be blurred using slow speed.
More powerful visual impact sometimes can be created by slow shutter speed, than images taken with action-freeze high shutter speed.
Precautions to be taken for taking better pictures
1) While shooting the pictures of individuals, turn the camera on its side. This helps in reducing the wastage of lots of film on the background.
2) While taking sunset pictures turn the flash off to avoid a result that's dark.
3) If you are carrying a camera to a beach see that it's well protected inside a carry case, because a slightest contact of sand with the camera can jam up the camera.
4) When you are taking photos in the dark interiors such as clubs or pubs tell the person to move towards bright light for few moments before you take a flash picture.By doing so one can reduce the risk of red- eye.
Shutter speed helps in taking good pictures even in unfavorable climatic conditions. It also helps in taking photos of the moving objects.