Here are some technical information about how to set/use and play with the exposure in order to create an HDR image using a Canon EOS 550D (which is my camera).
Using the exposure compensation setting, you can capture images at different exposure levels, and then select the optimal image later as shown in the example below. This is called AEB (Auto Exposure Bracketing) shooting.
You can set your camera so that the shutter speed and aperture value are changed automatically to capture three successive shots with exposure bracketing of ±5-stops in 1/3-stop increments.
Standard Exposure Decreased Exposure Increased Exposure
How to set the AEB shooting
1. Set the power switch to <ON>.
2. Press the <MENU> button to bring up the menu.
3. Under the [ ] tab, select [Expo. comp./AEB], then press <SET> button.
4. Turn the <Main Dial> to set the AEB amount.
Press the <Cross Keys> to set the exposure compensation amount. If AEB is combined with exposure compensation, AEB will be applied centering on the exposure compensation amount
5. Press <SET> to set it.
When you press the shutter button halfway, the AEB amount will be displayed on the LCD monitor.
6. Focus and press the shutter button completely. The three bracketed shots will be taken in this sequence: Standard exposure, decreased exposure, and increased exposure.
However, since we are often using Nikon in class for practices, here’s some helpful video tutorials on taking photos for HDR using a Nikon: