The shutter in the camera is a device used to allow light to enter and hit the image sensor or the film, after passing through the lens and the aperture diaphragm. Imagine the shutter to be a door, the moment you open it the light from outside enters the room and when you close it, the room becomes dark. The duration for which the shutter remains open is defined by the shutter speed.
Shutter Speed is the length of time for which the shutter is open to expose the image sensor/film. The shutter speed is denoted in seconds or fractions of a second, e.g. 2 sec, 10 sec, 1/50 sec, 1/250 sec, etc.
When you press the shutter release button on your camera, the shutter opens and exposes the image sensor to light for the duration of time defined. The faster the shutter speed is, the lesser the duration of time the image sensor will be exposed to light. Similarly, the slower the shutter speed is, the more the duration of time the image sensor will be exposed to light.
A faster shutter speed can be used to freeze the subject in your frame, whereas slow shutter speed can be used to capture the subject in motion or a long exposure shot.
NOTE: To fully explore the use of shutter speed, switch to the Manual Mode so that the camera does not define the other two elements of the exposure triangle (aperture value and ISO) on its own.
Shutter speed is measured in seconds and fractions of a second, which range from 1/8000 (in modern day DSLRs) to 30 seconds. Beyond 30 seconds, you can use the ‘Bulb mode’ to expose the image sensor for minutes.
While clicking handheld shots, try and set the shutter speed at minimum 1/60 second or faster to avoid any shake. Ideally, shutter speed below 1/60 second is best suited to capture the motion of the subject or to click long exposure photos.
The focal length at which you are shooting is also one of the factors affecting minimum shutter speed required to shoot a shake-free image. So, while shooting at 35mm focal length 1/60 second would be the minimum shutter speed to avoid shake, whereas 1/200 would be the minimum shutter speed at 300mm focal length.
As I mentioned it earlier, the shutter speed decides whether to freeze the subject in the picture or to capture a motion effect. I have classified shutter speed into three categories: Fast, Slow and Very Slow.
Ideal for Sports and Wildlife photography, fast shutter speed freezes the moving sportsperson or the bird/animal to capture the moment in action. Using a shutter speed of 1/500 second or faster will result in a sharp photo where the subject is captured steady in action.
Trust me, you can experiment with slow shutter speed to click creative frames using lights, clouds or even water. For example, you can click a frame wherein a car appears to be sharp and stationary and the background is in motion by using shutter speed of 1/15 second (try this using a monopod/tripod for better result).
Using shutter speed in seconds or shooting on Bulb Mode at the right moment can result in awe-inspiring photos. Colorful fireworks all over the sky, some name captured on a photo using a torch or star trails that appear to be circular lines can all be captured using long shutter speed. Make sure you mount the camera on a tripod to avoid shake.
Shutter Priority mode gives you the power to control the shutter speed as per your need, whereas, the aperture value will be automatically defined by the camera.
If you have turned off the auto ISO option, the camera will also define the required ISO sensitivity as per the lighting in the frame. My advice would be to set the ISO at 100 to avoid grains in your final image.
Here’s an example explaining how you can use the shutter priority mode at its best:
Suppose you want to capture a moving car and want to freeze it in the image, you must choose a fast shutter speed (say 1/1000 second) and the camera will on its own choose an appropriate aperture as per the available light.
On the other hand, if you wish to show the car in motion (motion blur effect), set a slow shutter speed (say 1/30 second).
NOTE: Considering the same lighting conditions, as we increase the shutter speed (e.g. from 1/50 to 1/100 second) the aperture value will decrease (wider aperture) in order to let more light in and vice-a-versa. To sum it up, the faster the shutter speed, the shallower will be the depth-of-field (using the shutter priority mode), considering the same lighting conditions.
Blog post and images by: Kunal Malhotra