Please analyze the use characteristics of fixed lens and moving lens in documentary with specific works.

A: In a film, if there are many moving shots, the amount of information is small and the pace is slow;

On the contrary, there are many fixed lenses, large amount of information and fast pace.

In addition, sometimes moving the lens takes a long time and contains a lot of information. We are talking about the general law at the same time.

Four principles of fixed lens:

(1), the camera should capture the movement of the subject position. Although the lens is fixed, objects and people should be moving.

(2) The camera should capture the posture change of the subject.

(3) The camera should capture the changes in the appearance of the subject.

(4) When there are many fixed shots, the rhythm and rhythm can be formed by switching shots.

There is nothing absolutely static in the world; Exercise is a form of life.

For photography, sports are all kinds of activities with different strengths.

People's pursuit of visual interest is endless. Photography shows the movement of objects, which is the most subtle and effective way to spread information by using visual characteristics, and can be used frequently and continuously.

Sports photography is also the most attractive artistic means for documentaries to reflect the life world. Any sport has its own speed and rhythm.

Composition factors such as scenery, angle and accompaniment can change the speed and rhythm of action. Reasonable treatment of objective movement speed, rhythm and subjective perspective can achieve ideal aesthetic effect. On the contrary, if not handled properly, the scenery and angle will destroy the rhythm of the action itself.

The shooting of moving objects is a comprehensive test of the skills of "picking, waiting and grabbing". Everything has its own laws: static and dynamic, fast and slow changes, both orderly and unknown. It is valuable to show the "sequence" of activities, but it is more precious to "wait" or "grab" unexpected dynamics.