Creative Exposure Mode – Shutter Priority – Chapter 3
The objective of this chapter is to make you understand the following statements:
- What is shutter priority mode (which is pretty obvious)? and
- What are the different shutter speed?
So what is Shutter Priority?
Shutter is kind of curtain in front of the sensor of the camera. After pressing the shutter release button (the button you press to take pictures), the shutter moves and allows light to pass on to the sensor of the camera. In Shutter Priority mode you can adjust how fast this curtain moves and allow the light to pass on to the sensor thus controlling the amount of light reaching the sensor. Modern day digital cameras let you adjust the shutter speed through the shutter priority mode.
Here is the book definition of shutter priority mode.
Shutter priority is the creative exposure mode in which you can select the shutter speed and the camera selects the corresponding aperture for the correct exposure.
On a Canon and Pentax it is denoted as Tv (Time Value) and on a Nikon and Olympus it is denoted by S on the top dial of the camera.
What are different shutter speeds in a camera?
As compared to aperture priority, the concept of shutter speed is relatively easier to understand. It is measured in seconds or fraction of a second. Following are some shutter speeds. Please note that the numbers are in seconds.
1/8000 – 1/4000 – 1/2000 – 1/1000 – 1/500 – 1/250 – 1/125 – 1/60 – 1/30 – 1/15 – 1/8 – 1/4 -1/2 – 1 and so on.
So, 1/4000 here on the above scale means a shutter speed of 1/4000th of a second.
Going from left to right on the above scale lets roughly double the amount of light on to the sensor. Similarly going from right to left on the above scale lets roughly half the amount on light to the sensor. Thus, If you are shooting at say 1/500th of a second and then adjusted the shutter speed to shoot at 1/250th of a second you are allowing one stop of light to the sensor.
Shutter speed determine the how subject in motion are recorded on the sensor of the camera. A fast shutter speed, freezes the action while a slower shutter speed record the action as a blur.
If you have seen light trails of cars in an image it is the result of a slower shutter speed.
So, how slow is slow to get a blur out of the action and how fast is fast? check out in the next lesson.
In the next lesson I shall discuss “what effect shutter speed control would bring in your images”. And I sign off with the same argument that I don’t want the beginners to get confused with all the information in a single Post. So stay tuned for the next lesson.