1. 20 camera parts of the Canon Rebel T3i

2. Shutter button
Hold it down halfway to focus, then push all the way to take the picture

3. Main dial
Cycles through options for many of the settings you can choose-- (like different shutter speeds when you want to control the shutter speed)

4. Lens
focuses
Focuses light to form an image

5. Lens release button
Push button to remove lens from camera body.

6. Power switch
Turns camera on and off

7. Viewfinder eyepiece
Photographer can look through this to compose and check the focus of a picture. Can also use the LCD monitor instead.

8. Mode dial
Used to change the camera’s mode of shooting—like manual mode (where all of the settings are set by the photographer) or automatic mode (where the camera sets all of the settings)

9. ISO button
This button and the Main Dial are used to change how sensitive the camera is to light. Lower the ISO number, the less sensitive the camera is to light, while a high ISO number increases the sensitivity.

10. Battery compartment
This is where the camera battery is located.

11. LCD monitor
Photographer can look here to compose and check the focus of a picture. Also the camera settings can be displayed here. The Viewfinder Eyepiece can be used instead.

12. The different camera settings as shown in the LCD monitor

13. SET button
Finalizes (sets) changes made in the Menu or Quick Selection screen.

14. Memory card
or SD card
A small, portable card used to store pictures and video (data).

15. Playback button
Shows pictures that are on the memory card. Uses the right and left arrow to move through the pictures.

16. Erase button
Deletes pictures from the memory card.

17. Focus mode
switch
AF means “auto focus” (the camera focuses when you hold the shutter button down half way). MF means “manual focus” (you have to focus

18. Image stabilizer switch
When on, it reduces blurring due to slight camera shake.

19. dioptic adjustment knob
Adjusts the viewfinder’s clarity for your eyes to get the auto focus points to look sharp.

20. Live View shooting and Movie shooting button
Switches from viewing on the LCD Monitor to viewing through the Viewfinder Eyepiece. Also is the record button when doing video recording.

21. Menu and Quick control buttons Arrows
Changes many functions and options. Shows on the LCD Monitor. Uses other buttons, like the Main Dial, SET button and arrows, to move between the different options available and finalize the choice.