Photography problem: How to take photos in the following situations 1. The stage is to perform cheerleading and dancing (how to take pictures).

Know them before you learn to use them.

This document is mainly about aperture, shutter and ISO. These three parameters are very important when taking photos, which directly affect the final effect of photos!

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens, usually in the lens. The aperture size is expressed by the value of f, the larger the value, the smaller the aperture, and the smaller the value, the larger the aperture. The smaller the f value of the aperture, the more light enters per unit time (because the aperture of the aperture is large), and the amount of light entering at the upper level is exactly twice that of the lower level. For example, if the aperture is adjusted from f8 to f5.6, the amount of light entering will double. We also say that the aperture is enlarged by one level.

Apertures are like faucets. If you turn it up, a lot of light will enter; If you turn it down, you will only get less light. From the upper left to the lower right of the figure, the aperture size is in different states of closed aperture, f 1 1, f8 and f4 respectively. From this, we can also understand that the larger the aperture, the stronger the light projected on the CCD photoreceptor of the digital camera. When we buy lenses, the size of the aperture is a very important factor, which directly affects the price. A large aperture lens is much more expensive than a small aperture lens. Large aperture can perform better in dark environment, get more light without changing the shutter speed, and let the photos be exposed normally. At present, the aperture of professional zoom lenses can generally be opened to F2.8, and fixed-focus lenses such as Canon 50MM can be opened to 1.4! Large aperture can not only get more light, but also get the effect of shallow depth of field (the so-called depth of field means that when the focal length is aimed at a certain point, the front and back can still be clear). The larger the aperture, the shallower the depth of field, which is vulgar, that is, the subject is clear, the background is blurred, and the theme is highlighted. It is often used for portrait shooting. The smaller the aperture, the greater the depth of field, that is, the foreground background is clear and suitable for taking landscape photos. Controlling the depth of field is not only related to the aperture size, but also related to the focal length and shooting distance of the lens. Today, I mainly talk about different combinations of aperture, shutter and ISO to take photos with different effects.

Shutter is a mechanical or electronic device that controls the exposure time, and it is a device that blocks light from coming to the lens. Generally speaking, the larger the shutter time range, the better. Controlling the light entering time is the basic function of the shutter. It cooperates with the aperture to meet the needs of exposure. In order to make it easier for everyone to understand, we can also say that the shutter is the control time for the camera to keep the currently set aperture size. The expression of shutter speed is also set with corresponding numbers, such as 1/30s, 1/60s, etc. They represent the time to keep the currently set aperture size at 1/30 seconds and 1/60 seconds respectively. How to set the shutter time depends on the subject and light. If you are shooting ball games, birds and other moving objects, you should generally set the shutter at 1/300 seconds or more to avoid the photo paste! When shooting a still object, the shutter speed should not be lower than 1/30 seconds, because according to statistics, when shooting with a handheld camera, the stability of the hand is so great that it stays in the time range of 1/30 seconds. If it exceeds this time range, the hand will shake, making the photos paste. If it is an iron fist, it is another matter!

It's best to take a tripod when shooting at night, because according to my past experience, shooting at night with a camera makes me want to cry! It's best to use a small aperture to shoot the night scene, because a small aperture can shoot the starlight effect of the light, which is very beautiful. However, the use of a small aperture forces the camera shutter to be set very slowly, so as to have enough time for exposure! I once saw a master's work, and the exposure time was five minutes!

Different combinations of shutter speed and aperture size can get the same exposure. What does this mean? ? For example, there are two sets of exposure combinations. A. shutter speed 1/30 seconds, and aperture f value of 5.6. B The shutter speed is1/60s, and the aperture f value is 4. Although the aperture and shutter values of the two groups are not equal and the exposure is the same, it does not prove that the photos taken are exactly the same!

Finally, there is sensitivity. The so-called sensitivity refers to the ability to perceive light, which is the ISO value we often see. ISO values are usually ISO 100, 200, 400 or higher. The source of sensitivity should be the photosensitive effect of traditional film. Traditional films have different sensitivity to light due to different production processes, which of course forms the level of sensitivity. Generally speaking, in the case of low ISO or low sensitivity, the picture is clearer and more detailed. And high ISO can cope in dark environment, but high ISO will increase the dry spots on the photos! Therefore, if possible, it is best to use low ISO.

These three parameters are usually adjusted when taking pictures with a digital camera. When I take pictures, I first consider the aperture size, and then the shutter speed. ISO is the last consideration. In the case of fixed aperture, the setting of ISO value is generally based on the shutter speed. Author: great achievements