Three elements and six laws of photography

The three elements of photography are as follows:

1. Exposure: Exposure refers to the amount of light received by photosensitive materials or image sensors in photography. Proper exposure can ensure that the image has moderate brightness and rich details, and avoid overexposure (too bright) or underexposure (too dark). Exposure can be controlled by adjusting shutter speed, aperture and ISO sensitivity.

2. Aperture: Aperture refers to the size of light entering the aperture of the camera lens. The adjustment of aperture size will affect the depth of field (focus range) of photos. A larger aperture (small aperture value) can produce a shallow depth of field, making the subject clear and the background blurred, while a smaller aperture (large aperture value) can produce a larger depth of field and keep the whole picture clear.

3. Focal length: Focal length refers to the distance from the optical axis of the lens to the imaging plane, which determines the viewing angle and magnification of the image. A shorter focal length (wide angle) can shoot a wider scene, while a longer focal length (telephoto) can magnify distant objects. The choice of focal length will affect the perspective effect of the image and the compression effect of the background.

Six laws of photography

1, exposure law: exposure has a certain relationship with shutter speed, aperture and ISO sensitivity, that is, if the shutter speed is doubled, the aperture is reduced by one level and the ISO sensitivity is doubled, the same exposure can be obtained.

2, the law of focus: in photography, to ensure that the subject is clear and sharp, it is necessary to focus correctly. The law of focusing points out that the focus is on the subject, not the background, to ensure the clarity of the subject.

3. Backlight law: Backlight refers to the situation that the light source is behind the subject and facing the camera. The law of backlight tells us that exposure compensation or flash should be used to make up for the overexposure of the subject by the background.

4. Trigonometry: Trigonometry refers to dividing the picture into three equal parts horizontally and vertically, and placing the theme or element at the intersection can enhance the balance and attraction of the photo.

5. Contrast law: Contrast refers to the difference between bright and dark parts in an image. The law of contrast tells us to control the contrast of the scene reasonably to avoid losing details in the case of overexposure or underexposure.

6, the law of motion: the law of motion points out that the use of appropriate shutter speed can determine the motion effect in the photo. A faster shutter speed can freeze a fast-moving subject, while a slower shutter speed can show the motion blur effect of the subject.