Changing the ISO on the camera adjusts the cameras sensor to light and how much it allows in the image - this is done using the 'M' function on the camera dial. The higher the exposure, the brighter the image.
If the exposure is too high the image becomes 'overexposed', it is too bright and can become unclear and grainy - particularly if it was originally quite dark.
A low exposure setting will make dark sections of an image even darker.
 |
| High exposure |
 |
| Low exposure |
Shutter Speed
The shutter speed is a measurement of how long the shutter stays open for. This is controlled by putting the camera in 'S' mode (shutter priority).
Increasing the shutter speed by one step reduces the amount of time the shutter is open by one half.
Decreasing the shutter speed by one step increases the amount of time the shutter is open by one half.
The longer the shutter is open for, the more light enters. Therefore, if you take a photo of a moving object with a slow shutter speed you will get a blurry image that shows the movement of the object. However if you take a photo of a moving object with a fast shutter speed, you will get a clear image as there was less time to allow for light to enter the camera.
 |
| Slow shutter speed |
 |
| Fast shutter speed |
Aperture
Aperture controls the depth of field of the camera. It is controlled by putting the camera in 'A' mode (aperture priority).
Depth of field is the amount of distance between the nearest and farthest objects that appear in sharp focus in a photograph. A higher aperture results in a longer depth of field and vice versa.
 |
| I found it difficult to select the right aperture setting in order to show this, however this image that I took is an example of a photograph with a decreased depth of field. |
No comments:
Post a Comment