What kind of camera can ensure that objects at different distances can focus accurately?

To solve your problem, you must first understand what depth of field is:

When shooting, the process of adjusting the camera lens to make the scene at a certain distance from the camera clearly image is called focusing, and the point where the scene is located is called focus. Because "clarity" is not an absolute concept, the scene can be imaged clearly in front of the focus (close to the camera) and at a certain distance behind it. The sum of the front and back ranges is called the depth of field, which means that the scenery in this range can be clear. The depth of field is first related to the focal length of the lens. The lens with long focal length has small depth of field, while the lens with short focal length has large depth of field. Secondly, the depth of field is related to the aperture. The smaller the aperture (the larger the numerical value, for example, the aperture of f 16 is smaller than f 1 1), the greater the depth of field. The larger the aperture (the smaller the value, for example, the aperture of f2.8 is larger than that of f5.6), the smaller the depth of field. Secondly, the depth of field in the foreground is smaller than that in the back, that is to say, after precise focusing, the scene in front of the focus can be clearly imaged, while the scene in the back of the focus is clear.

The spatial depth that can be seen clearly at the same time is called the imaging spatial depth of the eye, that is, the depth of field.

Calculation formula of depth of field:

Depth of field = (2 * circle diameter * square of lens focal length * aperture value * square of focal length)/(square of D circle diameter of lens focal length * square of aperture value * square of focal length)

As can be seen from the formula, the back depth of field >: the foreground is deep.

It can be seen from the formula of depth of field that the 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 by the size of the allowable dispersion circle). These main factors affect the depth of field as follows (assuming all other conditions remain the same):

(1), lens aperture:

The larger the aperture, the smaller the depth of field; The smaller the aperture, the greater the depth of field;

(2), the lens focal length

The longer the focal length of the lens, 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.

References:

/view/7278.html？ wtp=tt

As can be seen from the above, it takes a lot of depth of field to get the clearest image, whether it is a distant view or a close view. You can try the following methods:

When the sun is shining and the sun is burning, adjust the lens to the widest angle and shoot the scenery under the light (that is, you have to turn your back to the sun). At this time, because the focal length is short and the aperture is small, the depth of field is relatively large.

If your camera has aperture priority mode, you can adjust the aperture to the minimum (keep the camera stable at this time) before taking pictures, and the depth of field will be great.