The range of digital camera aperture

The range of digital camera aperture, for friends who like photography, needs to know more about the camera, and aperture is one of the key points. Friends who like photography can learn digital succession with me, and then I will tell you the aperture range of popular science digital camera.

Digital camera aperture range 1 digital camera aperture range

The English name of Aperture is aperture. Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Usually in the camera. That is what we usually call the aperture value F2. 8.F8, F 16 is the "coefficient" of the aperture, and it is a relative aperture, not the physical aperture of the aperture, which is related to the physical aperture of the aperture and the distance from the lens to the photosensitive device (film or CCD or CMOS).

We use the f value to represent the aperture size. 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. The complete series of aperture values are as follows: F 1, F 1. 4，F2，F2 .8，F4，F5 .6、F8，F 1 1，F 16，F22，F32，F44，F64 .

It is worth mentioning here that the smaller the f value of the aperture, the more light enters in the same unit time, and the light entering in the upper level is exactly twice that of the lower level, for example, the aperture is adjusted from F8 to F5. 6, the amount of light will double, and we also say that the aperture will be opened by one level. Most non-professional digital camera lenses have short focal length and small physical aperture, and the physical aperture of the aperture is already very small in F8. If it continues to shrink, optical phenomena such as diffraction will appear, which will affect imaging. Therefore, the' minimum aperture' of general non-professional digital cameras is from F8 to F 1 1, while the photosensitive device of professional digital cameras has a large area, and the lens is far from the photosensitive device, so the aperture value can be very small. For consumer digital cameras, the aperture f value is often between F2. 8—F 16. In addition, many digital cameras can adjust the aperture with 1/3.

Range of digital camera aperture 2 How to use aperture when shooting with digital SLR camera?

When using card DC, many people will aim at the target and press the shutter, and few people will pay attention to the technical details in this process. Yes, this is the correct way to use the DC card. However, if you have a digital SLR in your hand, this method of taking pictures is not "professional" enough, not to say that you can't, but it is too overqualified. Therefore, when you get a digital SLR, it is necessary for you to understand some basic concepts and terms related to photography.

Let's talk about aperture first. Perhaps most people have this feeling. If you see a digital camera with a large lens aperture, then you will feel that this product is professional enough and upscale enough. In fact, this statement is reflected in the terminology, which is the aperture. Note that the aperture is a lens parameter, not a digital SLR. However, when taking pictures with digital SLR, the selected aperture size is finally implemented on the lens. Therefore, we can have an intuitive understanding of the aperture through the lens.

Generally speaking, under the same focal length, the larger the lens aperture, the larger the lens aperture and the greater the lens luminous flux. What are the advantages of a large amount of light?

First, more light can participate in imaging through the lens, so that when shooting in low light, you can use the light of the scene to shoot without a flash.

Secondly, the larger the aperture, the more favorable it is to take photos with shallow depth of field, that is, photos with clear focus but blurred background. Remember I once said that "you need a large aperture lens to shoot people with blurred backgrounds at will"?

Third, the aperture is an important grade to measure the lens. In addition to the above two advantages, large aperture lenses generally use better materials. For example, various aspheric lenses and ultra-low dispersion glass can make the imaging clearer and sharper, resulting in various distortions.

Of course, there are gains and losses, and the lens with large aperture is also caused by some negative factors: for example, it is bigger and heavier and inconvenient to carry; Of course the price is more expensive. The price of a large aperture lens can easily exceed 5 digits, even more expensive than the digital SLR itself.

In photography, the size of the aperture is determined by the f value. F= lens focal length/maximum aperture diameter. You can usually see F2. F4。 0、F5 .F8。 0, F 1 1, etc. You don't habitually think that the bigger the number, the bigger the aperture. In fact, in this equation, the diameter of the light hole is the denominator, so the larger the light hole, the smaller the f value. So the size of the aperture should be sorted as follows: F2. 8> F4.0 & gt F5.6 & gt F8.0 & GTF11and so on.

It should also be noted that the aperture of the lens is not constant, but can be changed (see the article with pictures for details). When we say that the aperture of the lens is the maximum aperture, we don't mean that it is fixed at this size. Just like I have a 500-horsepower sports car, I don't have to drive faster than a 200-horsepower car. Maybe I just keep the engine at a low speed and cruise gently, but when necessary, my sports car will burst into more energy.