Today we would be moving forward to our second pillar of photograpy, Shutter Speed!!
Shutter speed is the fraction of time for which the shutter stays open; it’s the time to which your camera sensor is exposed to your picture or if you are the ones who had hands on film cameras, it would be the time that the film was exposed to the scene.
Very short shutter speeds can be used to freeze fast-moving subjects, for example speed like 1/1000sec at sports events. Very long shutter speeds are used to intentionally blur a moving subject for artistic effect like 1/30sec. Short exposure times are sometimes called "fast", and long exposure times "slow".
Shutter speed is measured in fraction of seconds, like 1/1000 is said to be faster speed than 1/10 where in 1/1000 mean to be 1000th fraction of 1 sec.
It is said that 1/60sec is a man hand hold speed, anything slower than this would create a shakiness which could blur the picture, and however for slow shutter speed we can use tripods, or some concrete plane surface to support camera. Through practice and special techniques such as bracing the camera, arms, or body to minimize camera movement longer shutter speeds can be used without blur
To avoid camera shake it is suggested to have Shutter speed equal to 1/[focal length of the lens]
The shutter speed can be as fast as 1/4000sec to as slow as 30secs. Increasing shutter speed by one stop and decreasing the aperture one should give you similar exposure level.
Shutter speed is always used when we have to show movement or things are moving like a racing event. You can freeze the moment by choosing the high speed like 1/2000sec or you can have a blurry look by choosing 1/20sec.
Example, you are driving an open jeep, and you friend tried to click you at say 1/70sec speed. You will find your image is sharp however everything passing you buy is blurred
Zoom Burst [Wiki] :
Zoom burst is a photographic technique, attainable with zoom lenses with a manual zoom ring.
Using the technique involves zooming while the shutter is open with a relatively slow shutter speed, generally below 1/60th of a second. For this reason low light or small apertures are required. It is also possible to achieve a similar effect with either computer software like Adobe Photoshop (after the photo has been shot) or a photographic filter. In these cases the shutter speed can be as fast as necessary.
Photographs taken with this technique are characterized by blurred streaks emanating from the center of the photograph. The effect is nearly identical to a motion blur image in which the camera is traveling towards the subject. For this reason the zoom burst is typically used to create an impression of motion towards the subject.
We will discuss about ISO in out next post ..
Keep clicking ....