Limited aperture, how to compensate for the lack of depth of field?

The size of the depth of field is determined by three factors: aperture, focal length and shooting distance, the smaller the aperture (the larger the aperture value), the greater the depth of field, the longer the focal length of the lens, the smaller the depth of field, the farther the object distance, the greater the depth of field, if the depth of field is not obvious to control with the aperture, you can use the focal length control, the depth of field in the telephoto section is small, and the depth of field in the short focal length segment is large.

If you don't think the aperture is wide enough, you can also stretch the focal length, shoot with the telephoto end, or shorten the distance to the subject. can make the depth of field shallower.

Of course, if you want to shoot landscapes and see both far and near, you can use a small aperture (i.e. the one with a large f-number, such as f11) and use the wide-angle end to focus on distant objects as much as possible.

Method 1: Try to use a wide-angle focal length, if it really doesn't work, you can connect another adapter and match a wide-angle lens.

Method 2: Try to focus on the object that is far away, so that the nearest object is within the depth of field.

In addition, digital cameras often lose wide angle and earn telephoto. In the case of telephoto, the depth-of-field effect is not necessary. Finally, it should be the maximum aperture, right?

If it's the smallest aperture, what is your maximum aperture? How many tenths of a day? Are your shots in the hundreds of thousands?

The depth of field range is related to the size of the aperture and the focal length, the aperture is large, the depth of field is small, and the aperture is small, and the depth of field is large! The wide-angle end has a larger depth of field range than the telephoto end, and you can also adjust the distance from the subject to control the depth of field!

I know what you mean, but I remember that the aperture of the S5600 is definitely more than that, and you shouldn't have set it well!

Let's take a closer look!

1. The reason why the depth of field is smaller when the aperture is larger, that is, the small hole in the imaging is wider, then the small things in the distance will be blurred, and the larger ones will be clear.

2. Depth of field is the optical characteristics of the lens, the depth of field comes from the depth of focus, because the object is far from the lens, the gathering point of the phase plane is also divided into front and back, some are solid points, some become virtual points, this virtual point is called the diffusion circle, if the diameter of the diffusion circle is less than the ability of human identification, the distance between the virtual point and the real point is called the depth of focus. Experiments have proved that the longer the focal length, the larger the aperture, and the smaller the depth of field, as the name suggests, is the depth of the scene, which is the depth of the scene before and after the image is clear.

Depth of field is related to the aperture used by the lens, the focal length of the lens, the shooting distance, and the requirements for image quality (expressed in the size of the allowable dispersion circle). The effects of these main factors on depth of field are as follows (assuming all other conditions do not change):

1) Lens aperture: the larger the aperture, the smaller the aperture value, the smaller the depth of field; The smaller the aperture, that is, the larger the aperture value, the greater the depth of field;

2) Lens focal length: the longer the lens focal length, the smaller the depth of field; The shorter the focal length, the greater the depth of field;

3) Shooting distance: the farther the distance, the greater the depth of field; The closer the distance, the smaller the depth of field.

Because theoretically, after the mirror head parameters are fixed, only one "object plane" can be perfectly imaged in the "image plane", and the known object leaving this "object plane" will be focused outside the "image plane", and the point projection in the "image plane" will form a circle, which is called a "fuzzy circle", and the larger the aperture failure, the larger the fuzzy circle. The image below the minimum blurred circle radius that the human eye can recognize is considered to be clear, so the smaller the aperture, the more range the human eye thinks the image is clear, that is, the greater the depth of field.

The aperture value is large, and the depth of field is small; The values are small and the depth of field is large.

The numerical magnitude of the aperture and the amount of light entering the aperture are just the opposite.

Depth of field is the clear range of the front and back of the scene in a photographic picture; If it's clear from the foreground to the back, we say it's a large (or deep) depth of field. If only the subject is clear, and the foreground and background are blurry, we say that it has a small (or shallow) depth of field.

Aperture is used to control the amount of light that passes through the lens into the sensitive surface of the camera body, and is an extremely important metric parameter of the lens, usually within the lens. Its size determines how much light enters the sensor through the lens.

We use the f-number, the aperture f-number = the focal length of the lens The diameter of the lens aperture The complete aperture value series is as follows:, f11, f16, f22, f32, f44, f64 aperture The smaller the f-value, the larger the clear aperture (as shown in the figure on the right), the more light will enter in the same unit time, and the ** amount will increase, and the shutter will remain the same, the larger the aperture, the more light will enter, and the picture will be brighter.

For example, when taking pictures, as the aperture continues to decrease, the front and back of the object we shoot will become clearer and clearer, that is to say, the depth of field is getting deeper and deeper, so the relationship between aperture and depth of field is: the larger the aperture, the more serious the blur before and after the subject, the shallower the depth of field, the smaller the aperture, the slighter the blur before and after the subject, and the deeper the depth of field. The large aperture is often used to shoot subjects that need to highlight the subject, such as flowers, close-ups of people and other subjects; The small aperture is often used to shoot subjects that require a clear background, such as landscapes.

Video player: 3 minutes to learn the aperture and depth of field.

Small aperture, large depth of field, large aperture, small depth of field.

Some of the earlier is true. You already know the effect of aperture on depth of field, but I won't talk about that. In addition to the aperture, the focal length of the lens also has a great influence on the depth of field, the longer the focal length, the shallower the depth of field (that is, the bokeh foreground or background), and the effects of aperture and focal length on the depth of field are superimposed.

Therefore, a constant large aperture zoom lens is better than a floating aperture zoom lens, because the former can achieve a good superposition of aperture and focal length. The latter is not optimal, and the aperture becomes smaller when the focal length is extended. For example, if the focal length of a lens is 500mm, even if the aperture is set to f8, its depth of field is very shallow.

I understand the meaning of the third point upstairs, but the expression is wrong. The distance of the shot does not affect the depth of field of the lens. However, if the subject is far away from the background, the background will be blurred better.

However, the depth of field of the lens does not change at this time, but the distance between the object and the background is artificially intervened, so that the background is more blurred.

There are three main factors that affect depth of field:

1) Aperture size, the larger the aperture, the smaller the depth of field, and the smaller the aperture, the greater the depth of field.

2) Lens focal length, the longer the lens focal length, the smaller the depth of field, and the shorter the lens focal length, the greater the depth of field.

3) Shooting distance, the closer the lens is to the subject, the smaller the depth of field, and the farther the lens is from the subject, the greater the depth of field.

It has nothing to do with the camera's autofocus and manual focus. In the specific production, the above three aspects should be taken into account.

In this way, it is not difficult to understand the meaning of entering the SLR pit and never turning over.

The two upstairs spoke very well, and they have made it very clear that I am not here to earn points, but to see the problem.