Join Richard Harrington for an in-depth discussion in this video Changing ISO, part of Learning the Canon Rebel T4i and T5i (EOS 650D and 700D).
IOS is a useful adjustment that modifies the sensitivity of your camera's sensor. As you increase ISO, you can use faster shutter speeds and smaller apertures. This is a typical adjustment you make when shooting in lower light. Keep in mind, though, that higher ISOs can add some noise, but the benefit is that they give you the option to use smaller apertures to catch deeper depth of field, and to use faster shutter speeds to truly freeze the action. To change ISO, press the ISO speed setting button.
Then, turn the command dial to choose a new ISO. Press the set button to apply the change, or just wait for the camera to auto apply the item. You can choose between settings that range from ISO 100 to ISO 12,800. With higher ISOs, you increase the likelihood of adding noise. Because these settings yield a lot of image noise and color distortion, you should use them as a last resort. Essentially, when it comes down to being very dark, and you don't wait to use the flash.
Is it the choice of getting the shot, or missing the shot? It's always a good idea for you to test out the IOS settings when you get a camera, and really review the images on your computer to truly see them. This will help you get familiar with the amount of noise, and decide which settings you're comfortable shooting with. To learn more about ISO, be sure to check out the Foundations of Photography Exposure Class here on Lynda.com, as well as the DSLR Video Tips Series.
Want to get up and running even faster? Check out the "Quick Start" chapter to learn how to use your T4i or T5i straight out of the box.
- Reviewing the lens controls
- Changing image format and size
- Adjusting ISO and exposure compensations
- Using Program Shift mode
- Exploring Autofocus
- Focusing manually
- Shooting in Continuous (burst) mode
- Switching between metering modes
- Shooting with flash
- Shooting video