After learning how to use Aperture Priority Mode on your dSLR you want to step into using the Shutter Priority Mode. This is the next step in your progression to becoming a more well-rounded photographer. Shutter speed and aperture work together to give proper exposure of light to the film or digital light sensor in your camera. Let's look at how shutter priority mode works to give you more control on your pictures.
Shutter Priority Mode
You place your camera in shutter priority mode by turning the mode dial on your dSLR to S or Tv. When placing the camera in shutter priority mode you are still allowing the camera to control the aperture and film speed (or ISO) while you control the shutter speed setting. The aperture, shutter speed and film speed together determine how much light your camera needs to give you a good exposure for a picture.
Shutter speed controls how long light is allowed to expose the film or sensor. Aperture settings control how much light enters the lens. And film speed (or ISO speed) controls how sensitive the digital light sensor will be to the light that is allowed in by the other two factors.
When your camera is in shutter priority mode it gives you control over how long the sensor will be exposed to the image being captured. You don't have to worry about the other factors since the camera is taking care of that to assure that you get a good exposure. You control the shutter speed time so that you can affect how the final image looks. A faster shutter speed will completely stop motion giving you sharp pictures without blurring. But there are times you want to show motion. You can do this by having a slower shutter speed.
To control your shutter speed properly, you will need to know how the settings work. Shutter speeds are represented in fractions of a second. Therefore 1/500 s leaves the shutter open for twice as long as 1/1000 s, but only half as long as 1/250 s. Remember that this time in seconds is how long the shutter is open allowing light to be captured by the film or the image sensor.
- Higher denominator = faster shutter speed = shorter light exposure = stops motion
- Lower denominator = slower shutter speed = longer light exposure = blurs motion
Using Shutter Priority Mode Creatively
The way that you could use shutter priority mode creatively is to intentionally blur some items in your pictures while keeping others in sharp focus.
Think of taking a picture of your child riding a bike. To show how fast they are going you can use a slow shutter speed and keep the camera still while taking the picture of your child speeding in front of you. This will keep the background in focus, but the child on the bike will be a blur of motion. Or, you could use the same shutter speed and instead of holding the camera still and capturing a blurred child with a crisp background, you could move the camera along the path of the child while you snap the picture. This will keep the child in focus but blur the background. This is how photographers capture race cars zooming by. They move the camera along the path of the car which will keep the car in focus, but blur the background.
Another way to use this mode is to take various pictures of a waterfall. If you wanted to stop the motion of the water coming down the side of the cliff you would use a fast shutter speed. To show the motion of the water coming down, you would shoot the picture with a slower shutter speed to allow the water to blur in the image.
Remember that when you increase or decrease your shutter speed manually your camera will have to adjust the aperture. This aperture adjustment will effect your depth of field.
Experiment with Shutter Priority Mode
Get outside and take pictures of your child on their bike. Find out which version captures the feeling of motion and freedom better. You can do the same thing with cars driving down your street. How about a busy indoor scene? You could set your shutter speed to 1 second or more and show the shopping mall standing still but a blur of activity going on within. Of course you need a tripod for slower shutter speeds.
Shutter priority mode is the next step after you have learned to use aperture priority mode. Just because you have graduated to this next mode does not mean that you no longer need the aperture priority mode. It just means that you have more tools in your photo bag to pull out and use when the situation arises.