Is the video taken with Canon 5D3 SLR camera clear? Why doesn't it feel as clear as a mobile phone?

If you have a large aperture lens or fill light, I suggest you use 5D3. As for the rest, I suggest you don't bother. 5D3 can improve the video shooting performance by brushing the firmware of magic lamp, but this is not suitable for ordinary users. 5D3 is a 20 12 studio camera after all. This product is very old, and it was not originally designed for shooting videos. If you have other shooting equipment, don't use 5D3. The video shooting ability of smart phones and micro-cameras has been upgraded rapidly in recent years.