What's a Follow Focus?
Sometimes it is necessary to follow the focal point when shooting a complex scene - the character moves back and forth relative to the camera, and then we have to mark the Follow focus, sometimes messy. Here are some simple but very effective markup techniques that give you a clear order of focus for easy viewing and use.
In addition to this effective method of marking the focus, Harn also gave us some hints, you need to distinguish between the Nikon lens and most of the different lenses, to focus in the opposite direction of rotation. For a Nikon lens, if you place your hand on the top of the Follow Focus, turning the Focus on the subject can move the focus to infinity, and of course, instead of turning the Focus backward to reduce the focus distance. For Canon camera lenses, and almost all other lenses on the market, keeping your hand at the bottom of the Follow focus, turning the Focus forward to focus on infinity, and turning it backwards brings the focus closer.
In addition, during video recording, the cameraman is not shooting with the handheld. Cameras often need to be fixed on a large tripod to use, while requiring a large number of accessories with.
For example: brackets, Follow focus, shading bucket, filters, monitor LCD screen, monitor headphones and so on. Before shooting all the accessories need to be installed in place, and adjust the center of gravity to shoot. If you change the lens and the center of gravity shifts and the position of the focus ring on the lens changes, all accessories need to be readjusted to re-shoot. This will result in a decrease in shooting efficiency.
And, at the optical level, the cinema lens is even higher. Especially in the wide-angle lens, the lens distortion control more in place, hidden corners smaller. In this way, when the moving lens is shot, the distortion of the edge will not separate the view of the audience from the actor.
All in all, all the design of the movie lens takes into account the needs of continuous shooting, in order to obtain a smooth and accurate video picture preparation. The SLR lens only needs to press the shutter moment, to achieve excellent results can be. This is the difference between the two.
