How to set the shutter when shooting boating with telephoto lens?

Safety shutter refers to hand-held anti-shake heartbeat, and the reciprocal of lens focal length is the lower limit. In fact, I have tested it, and the level is not enough. This value is too low. So I think the hand should be doubled and started at 600, which includes the compensation of relative motion caused by the error of following the mirror. The specific parameters should be determined according to the actual situation, your shooting distance, the angle between the moving direction of the subject and your shooting direction, etc.

The key to sports photography lies in your skill of following the mirror. As the subject moves your lens, the subject will always be in the composition position, and the relative movement between the subject and the composition will be reduced as much as possible. Increasing a certain shutter speed can offset the blur caused by relative motion and reduce the pressure on the mirror (both stable and moving). If you have a telephoto, because the viewing angle is enlarged, the displacement of the viewport will also be enlarged, so it is best to bring a tripod.

Finally, I think it is necessary to practice more to improve the stability of the mirror and the stability of breathing, which will lower the lower limit of your safety shutter.