Camera Parts

Aperture: An opening, hole, or a gap

Shutter: A device that opens and closes to expose the film in a camera

Exposure: A total amount of light allowed to fall on the photograph

Depth of Field: The distance between the nearest and farthest objects in a scene that appear sharp in and image 
F-Stop: A camera setting corresponding to a particular f-number

Focal Length: The distance between the center of a lens or curved mirror and its focus 

Canon T3 Design:
(Front)
3.) Flash button 

5.) Shutter button

21.) Lens release button

(Back)
1.) Aperture button
     Exposure compensation button 
     Erase button

6.) Live view button
     Moving shooting button

7.) Quick control button 
     Direct print button

9.) Menu button

10.) Setting button

11.) ISO speed setting button
       White balance selection button

       Drive mode selection button

       AF mode selection button

12.) Display button

13.) AE lock button 

       FE lock button 

       Index button

       Reduce button

14.) AF point selection button

       Magnify button

20.)Playback button