It depends on the model. Generally, the length of a single video is about 20 minutes (such as Nikon D7000), and some cameras will be shorter, mainly because the file size of full HD cameras must be less than 4G. When the file reaches 4G, it will be divided (such as Canon 6D, the longest time is about 30 minutes, but every time the file size reaches 4G, a file will be generated. Video is recorded continuously, but multiple files are generated. )

If it is used for wedding video, it is ok to use SLR for dual-station camera. But if it is used to record parties or single weddings, it is more dangerous. One is that the machine will crash and shut down when it is hot, and the other is that the video is difficult to continue.

The micro-GH4 time is not limited, and the heat dissipation performance is quite good. The only disadvantage of SLR is that the aperture is not large and the blur is not so beautiful. But the picture quality is still dripping.