1, viewfinder goggles: can play the role of shading and protecting the viewfinder optical lens, and can effectively separate the distance between the eyes and the lens.

2.DISP shooting setting display button: When this button is pressed, the detailed information of parameters or menus can be displayed on the LCD screen.

3. Menu button: Press this button to enter the camera's menu settings, and you can set many menu options, such as date, time, photo style, color space and image quality. , and control the information of taking photos.

4. Liquid crystal display: The 550D LCD screen is about 3.0 inches (0.08m) wide, with pixels of/kloc-0.04 million, which can display parameters such as aperture and shutter when taking pictures, and can also be used for real-time viewing and shooting.

5. diopter adjustment knob: By rotating this knob, users with different vision can clearly see the picture displayed in the viewfinder.

6. Real-time display of shooting/short film shooting button: When this button is pressed, the shot picture will be displayed on the LCD screen in real time; In addition, this button is also the start and stop switch when shooting short films.

7. Automatic exposure lock/flash exposure lock button/index/decrease button: Press this button to lock the exposure value when the camera is shooting normally and the exposure value of the flash; In addition, when playing back photos, the button has the functions of image index and reduction.

8. Auto focus selection/enlargement button: Press this button when taking pictures to quickly switch the focus position of the camera; When playing back a photo, you can zoom in to see it.

9. Aperture/exposure compensation button: Press this button to switch to Av aperture priority mode; This button can be used in combination with the camera main dial wheel to adjust the exposure compensation value.

10. Speaker: When playing a short film, the sound is played synchronously with the video picture through the speaker.