Regardless of whether the LCD display was active or disabled, pressing the Quick Control button on the Canon T3i while in capture mode will take you to the Quick Control menu system, where you can adjust various settings shown on the rear-panel display. As with the T2i, there's a Quick Control button dedicated to entering the Quick Control menu. The rear-panel display on the Canon T3i is also used for Canon's Quick Control menu system, first introduced in the Rebel T1i. The image below shows callouts for all the information shown on the Canon T3i's rear-panel display, by default. Let's take a closer look at some of the user-interface elements: Canon EOS Rebel T3i Rear-Panel LCD Display
#CANON EOS REBEL T3I PHOTO SAMPLES ISO#
Overall, the control layout places a few main controls (Power switch, Shutter button, Main dial, Mode dial, Display button, and ISO button) on the right side of the Canon T3i's top panel, with most of the other controls on the back of the camera. (You can also disable it with the Display button, configure it to remain on at all times, or configure it to stay switched off after the shutter button is released, requiring you to press the Display button to turn it back on again.) The Rebel T2i instead disables the LCD while the shutter button is half-depressed. It not only conserved battery life, but also reduced glare from the LCD when using the optical viewfinder. One feature we miss from from the T2i that's absent in the T3 is the infrared proximity sensor, which was previously used to turn off the LCD screen when you held the camera up to your eye.
(Exposure mode, aperture, shutter speed, exposure compensation, and exposure lock are the only things that can be configured without using the rear-panel display). The T3i's display makes for a clear, highly visible user interface, but probably does contribute to slightly shorter battery life, since the LCD has to be fired up any time you want to change anything beyond the most basic settings. Like the Rebel T2i before it, the Canon T3i relies on its high-res 3.0-inch color LCD screen for all user interaction, although it's now articulated, and hence can be viewed from far greater angles than was previously the case.
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