Please discuss the classification and function of lens angle.

The classification of lens angles and their functions are as follows:

1, low angle. Low-angle shooting refers to shooting the lens upward, which can make the object look more dignified and solemn. The use of this angle is usually used when shooting superheroes or war scenes, which can highlight the heroic image of the protagonist.

2. High angle. High-angle shooting refers to shooting the lens downward, which can make the object look tiny and powerless. The use of this angle is usually used when shooting horror films or crime films, which can create a tense atmosphere of terror.

3. Overlooking angle. Overlooking angle shooting means that the lens overlooks the subject and can fully show the scenery. The application of this angle is usually used when shooting large-scale scenes and mass scenes, which can highlight the huge number of people and the spectacular scenes.

4. Look up. Upward angle shooting means that the lens looks up at the subject, which can highlight the tall image of the subject. The use of this angle is usually used to shoot architecture, sculpture and comedy scenes, which can create exaggerated image effects.

Maintenance of lens:

1. Photographers are not allowed to disassemble the lens at will. If there is a problem, they should go to a special maintenance department to repair it. Otherwise, it can't be recovered after disassembly and can't be adjusted accurately. The damage caused by lens will affect the imaging quality of lens.

2. Do not wipe the lens with rough and unclean items.

3. When using the lens brush to brush the lens surface, keep the brush clean, and don't touch the brush with your hands. Wash the bristles with alcohol in time after they are dirty.

4. Don't add lubricating oil to the adjusting ring of the photographic lens at will. So as not to flow into the lens and contaminate the lens surface.

5. When not shooting, adjust the focus ring of the lens to infinity, adjust the aperture to full open, and retract the push-pull zoom ring and macro ring to improve the seismic performance of the lens.

6. When the photographic lens is not used for a long time, it is best to keep it in a glass sealed vessel filled with desiccant or sealed in a plastic bag filled with desiccant.