Follow these steps to take a picture in Live View mode on your Rebel T6i/750D using autofocusing and the default settings for Auto and Auto Flash Off modes:
Set the Mode dial to Auto or Flash Off.
Refer to the figure if you need help locating the symbols that represent these shooting modes.
Set the Mode dial to Auto or Auto Flash Off for point‐and‐shoot simplicity.Set the lens‐focusing method to autofocusing.
On the 18–55mm kit lens, set the switch to AF.
For handheld shots, also enable Image Stabilization, if your lens offers it. (On the kit lens, set the Stabilizer switch to On.) This feature helps to compensate for small amounts of camera shake that can blur an image when you handhold the camera.
Press the Live View button to engage Live View.
The viewfinder pulls the blanket over its head and goes to sleep, and the scene in front of the lens appears on the monitor. What data you see superimposed on top of the scene depends on your display mode; press Info to cycle through the available display options.
If you press the button and nothing happens, Live View may be disabled. To turn it back on, set the Live View Shooting option on Live View Menu 1 to Enable, which is the default setting. You can get to this option in any shooting mode except Movie, in which case Live View is automatically enabled.
Focus.
The default Live View AF (autofocus) mode is called Face Tracking, and continuous AF is enabled.
In this mode, the camera looks for faces. When it finds one, it will place an AF point over it and continually focus on that face. You can also manually tap on a face on the monitor to select it.
If there are no faces to detect, the camera reverts to FlexiZone‐Multi. Place the subject within the large, immobile, Area Frame (labeled here). The camera detects the predominant subject in this area and continually focuses on it.
Move the focus frame over your subject and press the shutter button halfway to focus.Because Continuous AF is enabled, you don't need to press the shutter button to begin focusing. This is called a rough focus. Its purpose is to make the scene intelligible when you see it on the monitor and to get the scene in the focus ballpark. When you're ready to take the photo, it's closer to being in focus than not, which speeds things up.
When you're ready, press the shutter button halfway and hold it there to complete autofocusing. When the final focus is achieved, the focus point (or points) turns green and the camera beeps, signifying that you're ready to shoot. If you've disabled Continuous AF, you don't get this "pre‐focus focus." You have to press the shutter button halfway to focus from scratch.
Press the shutter button fully to take the shot.
You see your just‐captured image on the monitor for a few seconds before the Live View preview returns.
To exit the Live View preview, press the Live View button.
You see the standard Shooting Settings screen. You can then return to framing your images through the viewfinder.
For some tips on exposure, flash, and autofocusing, see the end of the preceding section. All the notes provided there for viewfinder photography apply to Live View photography as well.