How to adjust the backlight parameters for 5D4 video shooting?

1. Set the video format. The global video system is divided into pal system represented by Europe and ntsc system represented by the United States. Canon SLR models such as 5d4 can choose the standard when shooting video. Before shooting, you must first determine the standard to be used. Pal system is used in China, but the frame rate of ntsc system is higher than pal system. For example, the N frame rate is generally 30 and 60, and the P system is generally 25 and 50. If you don't need to broadcast the shot material to the TV station, it is recommended to choose N format to make the video smoother.

2. Set the video resolution. 5d4 can shoot videos with up to 4k UHD resolution, with backwards compatibility 1080 high definition resolution, 720 resolution and low standard definition video resolution. Before shooting, you need to determine the resolution of the video you are shooting. Although the resolution is very high, the resolution is also very high, but the amount of data is also very large, and the post-production pressure is also great. Too low resolution will affect the appearance. Use the captured video to select the appropriate resolution. It should be noted that not all CMOS can shoot the 4k resolution of 5d4, but use the viewing angle for cropping, and the cropping multiple is 1.74 times, that is to say, at first, a 50mm lens is used for shooting, but the viewing angle of the shooting angle is equivalent to the focal length of 87mm, and the viewing angle with the resolution of 1080 HD and below has no such loss of viewing angle. When shooting, you should consider whether to use 4k or not. Usually, it is used to make online videos, documentary videos, promotional videos, etc. The resolution of 1080 is enough.

3. Set the frame rate. Video is composed of several frames per second, and the number of frames per second is the frame rate. For example, movies are 24fps per second, PAL standard TV broadcasting standard is 50fps, NTSC standard TV broadcasting standard is 60fps, and so on. The higher the frame rate, the higher the smoothness of the picture. If you want to move slowly, you need to shoot at a higher frame rate, such as 120fps, and then shoot at 30fps to make a video, which will slow down the playback speed. Under the HD resolution N system, the maximum frame rate of 5d4 is 120fps, and the frame rate of 30 or 60 can also be selected. Without upgrading, you can choose 60 frame rate or 30 frame rate.

4. Set the encoding rate. Code rate plays an important role in video, which directly determines the quality of video material and the scope of post-classification processing. 5d4 can choose video compression mode, that is, it can choose all-i high-rate intra-frame compression coding, or it can choose lower ipb code rate inter-frame compression coding. If you need to adjust the color or tone later, you'd better choose a higher bit rate. If not, ipb is enough. However, it should be noted that regardless of the bit rate, it is a compressed format, which can not be compared with the high-end camera of the original video format, and its post-adjustability is limited.

5. Select a video format. 5d4 can choose different video formats, such as mp4, mov, avc, etc. You can choose according to the purpose of the material. mp4 is used more widely, and mov can be adjusted more widely, depending on the demand.

6. Focus setting. Canon's old SLR cameras usually use manual focusing, because the real-time focusing ability is really poor and has no practical value, while the new generation SLR cameras (such as 5d4, 6d2 and 80d) all have full-pixel dual-core autofocus function. This makes autofocus and video shooting with focus become very useful functions. Especially when using stm silent focusing lens, the autofocus effect is the best when shooting video. When shooting, you must select the manual and autofocus buttons on the lens. When m is selected, autofocus will not start. If autofocus is set, you can also set continuous autofocus or single shot, and you can also choose the autofocus speed. It should also be noted that if a non-stm motor lens is used to shoot video, autofocus will record the focusing noise of the lens into the camera. If you want to record audio directly with the camera, you must avoid this situation.

7. Picture style settings. Portrait, standard, landscape, neutral, monochrome and other photo styles all affect the color of the video screen. Shooting video usually needs to keep more picture details in order to prepare for fine-tuning space in the future. Therefore, it is suggested to choose neutral as the photo style of shooting video.

8. Exposure settings. Just like taking pictures, 5d4 shooting video also needs to set exposure. In different environments and different illumination, the exposure parameters to be set will be very different. Exposure parameters are not discussed in detail here, but attention should be paid to shutter speed and frame rate when shooting video. For example, shooting at a frame rate of 50 frames, you can usually set the shutter speed to 1/50 seconds. If the shutter speed is too fast, the motion blur will be reduced and the screen will shake. If you need to shoot a large aperture lens under strong light, you must cooperate with the nd filter to control the exposure, instead of balancing the exposure by speeding up the shutter speed.