What is the function of aperture?

Question 1: What is the function of the aperture? Shutter is a component that controls the speed of light entering the camera, referred to as the speed of palace gate.

Aperture is a component that controls how much light enters the camera, and the aperture value is the amount of light.

Their relationship with photos is related to the brightness of the first photo and the color of the second photo.

If the shutter speed is slow and more light enters the camera, the photo will be bright, otherwise it will be dark.

The larger the aperture, the more light enters the camera, and the photo will be very bright, otherwise it will be very dark.

The larger the aperture, the smaller the depth of field, which means the background is blurred. The smaller the aperture, the greater the depth of field and the clearer the background. (Note: The aperture number is opposite to that on the camera. The larger the number, the smaller the aperture, and the smaller the number, the larger the aperture. )

The shutter speed and aperture will have different effects when they cooperate with each other.

Question 2: What is the function of the aperture on the camera? The aperture can adjust the luminous flux of the camera lens. When taking pictures under strong light, the aperture of the aperture should be reduced, otherwise it should be increased. Just like curtains, when the light is too strong, the curtains will be turned down, and when the light is dark, the curtains will be opened to make the room bright and suitable.

The size of the aperture is expressed by the aperture coefficient. The larger the aperture coefficient, the smaller the aperture. The smaller the aperture coefficient, the larger the aperture. For example, the aperture 8 is twice the aperture 1 1; Aperture 8 is half smaller than aperture 5.6.

Aperture can not only control the luminous flux of the lens, but also affect the depth of field. The so-called depth of field can be understood as the depth of the clear range of the scene image.

Question 3: What are the three functions of the aperture? (1) Adjust the lighting. This is the basic function of the aperture. When the aperture increases, the light intensity increases; When the aperture decreases, the light intensity decreases. It solves the exposure problem together with the shutter speed.

(2) Adjust and control the depth of field. This is the important role of aperture. Large aperture and small depth of field; Small aperture and large depth of field.

(3) affect the imaging quality. This is the function that the aperture is easily overlooked. Any lens has an aperture with the best imaging quality, that is, it is least affected by various aberrations. This aperture is commonly known as the best aperture. The exact position of the optimal aperture can be measured by using special instruments. Generally speaking, the best aperture is located at the position where the maximum aperture of the lens is reduced by about 2 ~ 3 steps. If it is greater than or smaller than the optimal aperture, lens aberrations such as spherical aberration, longitudinal chromatic aberration, coma, field curvature and astigmatism will increase, so try to use the optimal aperture when shooting to improve the imaging quality. The shape of the aperture will also affect the imaging quality. The closer the polygon is to the circle, the better the imaging quality. First, it is called "dog head" and "black head": low-end mass lens, including the head of low-end SLR camera.

Question 4: What are the advantages of a large aperture? Does the landlord know what the aperture value represents? Aperture value is the ratio of incident aperture to focal length, not the real aperture size. This is also the reason why the smaller the aperture value, the larger the aperture. Constant aperture is not only powerful, but also requires high workmanship. Constant aperture does not mean constant aperture size, but constant aperture value. For example, 70-200 F2.8, the aperture is 25mm when the focal length is 70, but the aperture at the 200mm end is 7 1.4mm when the aperture is 2.8, which is a great challenge to the workmanship and design of the lens. Floating aperture does not need such a precise design, which is why zoom lenses with constant aperture, including lenses with constant aperture value of 4, are expensive. Pursuing 2.8 is really not a big deal, because Canon once had a lens similar to 50 1.0 in the last century, but in the zoom lens, 2.8 is the representative of luxury and fine workmanship. When making a large aperture lens, the lens is often different from the ordinary lens, which ensures the light input and imaging quality. With a large aperture, you can shoot in low light to make a shallow depth of field, and sometimes you have to get it. You want to take a beautiful picture, but it's a pity that there is no tripod or large aperture lens because of insufficient light. This is why many people choose the 2.8 zoom head.

Question 5: What does aperture mean? What does aperture do? Aperture: Simply put, it is to control the amount of incident light. The larger the aperture value, the less incident light.

Aperture can also control the depth of field effect of imaging. Generally, the smaller the aperture (that is, the larger the aperture value), the greater the depth of field.

The combination of aperture value and shutter speed is an important factor in the success or failure of a photo.

Question 6: What are the advantages of a large aperture? Does the landlord know what the aperture value represents? Aperture value is the ratio of incident aperture to focal length, not the real aperture size. This is also the reason why the smaller the aperture value, the larger the aperture. Constant aperture is not only powerful, but also requires high workmanship. Constant aperture does not mean constant aperture size, but constant aperture value. For example, 70-200 F2.8, the aperture is 25mm when the focal length is 70, but the aperture at the 200mm end is 7 1.4mm when the aperture is 2.8, which is a great challenge to the workmanship and design of the lens. Floating aperture does not need such a precise design, which is why zoom lenses with constant aperture, including lenses with constant aperture value of 4, are expensive. Pursuing 2.8 is really not a big deal, because Canon once had a lens similar to 50 1.0 in the last century, but in the zoom lens, 2.8 is the representative of luxury and fine workmanship. When making a large aperture lens, the lens is often different from the ordinary lens, which ensures the light input and imaging quality. With a large aperture, you can shoot in low light to make a shallow depth of field, and sometimes you have to get it. You want to take a beautiful picture, but it's a pity that there is no tripod or large aperture lens because of insufficient light. This is why many people choose the 0.8 zoom head.

Question 7: What are the methods and skills of aperture? The smaller the aperture value, the larger the aperture, which can't be mistaken.

The subject needs to add an aperture in the shadow part to compensate for exposure.

The subject is close to white. If the picture scale is small and the environment is dark, you need to close the aperture.

The shooting environment is all white, such as snow scene, which needs aperture.

In fact, the above items are almost the same, because the camera metering is not based on the actual situation, and simply thinks that the average value of the whole picture is 18% gray level, so it should be compensated according to the actual situation.

The larger the aperture, the smaller the clearance range; Conversely, the smaller the aperture, the larger the clear range.

For specific applications, such as taking portraits, if the background is clear, your troops will be announced to seize the main position, so it is generally recommended to use a large aperture; When shooting scenery, you often have to shoot mountains, landscapes and water, and often close the aperture to achieve the picture effect.

Mastering these two knowledge points skillfully, your film should improve several levels. Let's go

Question 8: What is the function of aperture? The aperture size is to control the luminous flux ... the same as pinhole imaging! Through the amount of light, you can show the depth of the scene!

Question 9: What is the significance of aperture in photography? 1, concept

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. For the manufactured lens, the diameter of the lens cannot be changed at will, but the luminous flux of the lens can be controlled by adding a polygon or circular aperture grating with variable area inside the lens. This device is called an aperture.

2. Calculation method

The aperture size is expressed by f value.

Aperture f value = lens focal length/lens aperture diameter

As can be seen from the above formula, to achieve the same aperture f value, the aperture of a long focal length lens is larger than that of a short focal length lens.

3. Aperture function

(1) can adjust the amount of light entering the lens. When taking pictures, if the light is strong, you should narrow the aperture, if the light is dark, you should open the aperture. That is to say, the smaller the F value (other parameters remain unchanged), the more favorable it is for shooting at night. The adjusting ring on the rotating lens or the knob on the digital camera body is used to adjust the aperture size.

(2) Aperture is the most important factor to determine the depth of field, with large aperture (small aperture value), small depth of field, small aperture (large aperture value) and large depth of field!

Question 10: What is the function of digital SLR camera aperture and where is it adjusted? As the two upstairs said, the priority of using aperture is generally to control the depth of shadow. To put it bluntly, when you take a photo of a beautiful woman, you want to highlight the beauty itself, so it is best that only the beauty itself is very clear, and the background of the beauty is really empty and vague, so you need to use a large aperture, and the bigger the better. Also, a large aperture and a large amount of light can shorten the shutter time, so that you can have a higher chance to go out. On the contrary, if you want beauty and clear background, you have to narrow the aperture, which will increase the shutter time, so sometimes you have to improve ISO.

Remember, the smaller the aperture value f, the larger the aperture, and the larger the f value, the smaller the aperture.