What are the basic knowledge of SLR lens?

Now, SLR lens has become a necessary electronic equipment for travel, which can take beautiful and vivid pictures when traveling. But for some novices, the knowledge of SLR lenses is relatively lacking, and they don't know what kind of SLR cameras to buy. Then this paper will introduce the basic knowledge of SLR lens from three aspects: focal length, aperture and aperture.

SLR lens knowledge 1: focal length

Focal length refers to the distance from the lens center to the film plane. For a fixed-focus lens, its optical center position remains unchanged. For a zoom lens, the focal length changes with the change of the optical center of the lens. Modern SLR lenses also have a focal length range of 6 mm to 2000 mm, and the commonly used focal length range is 15 mm to 600 mm For those SLR cameras with the same frame, the changes in picture effects brought by focal length can be summarized as follows.

1, the focal length of the lens is inversely proportional to the viewing angle.

The longer the focal length of the camera, the smaller the angle of view of the lens, and the larger scene can be shot from a distance. The shorter the focal length of the camera,

It means that the larger the angle of view of the lens, the wider the scene taken at close range. 2. The focal length of the lens is inversely proportional to the depth of field.

The longer the focal length of the camera, the smaller the depth of field, which means that the clear range of the scene before and after shooting is relatively small. The shorter the focal length of the camera, the greater the depth of field, which means that the scene before and after shooting can be shot clearly.

Knowledge of SLR lens II: Aperture

The aperture of the lens is also the maximum aperture of the lens.

Its size is usually expressed by f, such as f2.8 and f2.0. The smaller the f, the larger the aperture. On the zoom lens, we can often see the expressions of f3.0-5.6, which represent the maximum aperture of the wide-angle end and telephoto end of the lens respectively. The larger the lens aperture, the greater the practical performance. Large aperture lens can use the light of the scene to shoot in the case of weak light, and shoot those effects of small depth of field, so that imaging can be combined with reality. However, the manufacture of large aperture lens is more complicated and the price is higher. Knowledge of SLR lens III: Aperture

Aperture is an adjustable light entry hole composed of multiple metal sheets in the lens, which mainly has the following three functions.

1, adjust the light. When the aperture increases, the illumination will increase, and when the aperture decreases, the illumination will decrease. It usually works with the shutter speed to solve the exposure problem of imaging.

2. Adjust and control the depth of field. The larger the aperture, the smaller the depth of field, and the smaller the aperture, the greater the depth of field.

3, affect the imaging quality.

Editor's summary: The above is the introduction of SLR lens knowledge in this paper. I hope I can give some help to novice photographers, so that they can have a preliminary understanding of SLR camera lenses, know the quality of camera lenses, and what kind of pictures different lenses are suitable for shooting, so as to facilitate the purchase of SLR cameras that suit them.

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