The painter constructs, the photographer exposes
Effects of Shutter Speed in Photo Exposure.
In digital photography, it is vital to know how to make manual adjustments to the exposure of your shots. This gives you the control needed to enhance your shots.
One of the areas that can be manually adjusted is the Shutter Speed:
What is Shutter Speed?
Shutter speed is the duration of time that the shutter is open to enable the image sensor to capture, or see, the scene to be shot. The specified value of shutter speed is f-stop e.g. f-1/60
The shutter speed is measured in seconds or fractions of a second, for example 1/60 and the higher the denominator the better e.g. 1/60 is better than 1/15.
The most common shutter speed for a digital camera is usually 1/60th of a second, anything less than this will require the use of a stabilizer or tripod because any slight shake or tremor of the camera will result in a blurred image. The blurring increases in direct proportion to the decrease in speed.
Now, normally the adjustment settings for shutter speed, on most modern digital cameras, will double with each adjustment.
When choosing a shutter speed you must also consider the focal length of the lens you are using.
The longer the focal length of your lens then the more risk there is of camera shaking, causing image blur. To justify this situation you will need to use a faster shutter speed.
This does not apply when a tripod or stabilizer is used.
The choice of shutter speed is determined by the focal length, so for example if the focal length of your camera is 100 mm then the shutter speed should be more than that around 1/150th or more.
How Shutter Speed Relates to the Other Elements Of Exposure.
When you make an adjustment to the shutter speed, you will also have to review the adjustments of the other elements which control exposure. For instance, if you increase shutter speed from 1/125 to 1/250 you will need to increase the aperture by that same scale to compensate for the changes.
This is due to the fact that when the shutter speed is increased, as in the example above, then the amount of light that is let into the camera will be half the required amount.
To compensate for this, you would usually increase the aperture in direct proportion to the increase the shutter speed
Alternatively you may decide not to make adjustments to the aperture. In this case , you would need to choose a faster ISO rating in relation to the shutter speed.
Here’s an example of a poor photograph, which I took at the Berlin aquarium. Deep in a large tank, there was HUGE eel. My big lens was helpful to be able to zoom in on it, but the image is too dark, and there is motion blur. What what a fantastic creature.
Another image from the aquarium. That semi-sphere shape of the tank, makes the fish inside look magnified to a very gigantic appearance. What incredible aquarium engineering it is.
You know why I’m showing this… photos can be fun, and tell a story. Telling that story to others is part of the fun. Don’t worry about perfect technical parameters all the time. Just get the photo, and tell the story. People appreciate that.