For many photography beginners, after a period of study and practice, they finally have their first camera. However, the next choice of lens became a headache. Faced with a dazzling array of lenses, they are often confused: which one is really suitable for them? It is obviously unrealistic to want to buy them all because of the limited economic conditions; If you buy a random one, you are afraid that it will not be able to meet the needs of future shooting, so you will fall into a dilemma. In response to this problem, this article will share with you some basic knowledge that novices need to master when buying lenses.

The first thing we need to understand is the concept of focal length. In simple terms, focal length is the distance from the optical center of a lens to an imaging plane (such as a camera's image sensor or film), usually measured in millimeters (mm). It is a key indicator that determines the angle of view of the lens and the shooting effect, and also affects the field of view width and magnification of the picture.

Depending on the length of the focal length, lenses can be roughly divided into three categories: wide-angle lenses, standard lenses, and telephoto lenses. Among them, the focal length of less than 70mm is classified as a wide-angle lens, which has a wide angle of view and is suitable for shooting large areas of scenery, but the distortion is large and it is easy to produce a distortion effect. The lens between 0-0mm is considered to be a standard lens, and its angle of view is close to the angle of view of the human eye, and the shooting effect is natural and easy to use. As for the focal length greater than 0mm, it belongs to the telephoto lens, which is characterized by a narrow angle of view, which can shoot distant scenes, and has a good background blur effect.

When choosing a lens, we also need to pay attention to the type of lens. Some lenses have a fixed focal length, which is called a prime lens; Some can adjust the focal length, and this type of lens is called a zoom lens. The advantage of zoom lenses is that they have a wide focal length range, and one lens can adapt to a variety of shooting scenes, but their disadvantages are complex structures and relatively poor optical performance. The advantages of the prime lens are good optical performance, high image quality, and large aperture, which is suitable for shooting in low-light environments, but it cannot adjust the focal length and needs to move the shooting position to change the angle of view.

In addition, we also need to consider the matching of the camera body to the lens. Since the camera body is divided into full-frame and half-frame bodies depending on the size of the sensor, there is also a difference between full-frame and half-frame lenses. The conversion ratio between them is about 6.0 or 0.0 times. In order to give full play to the performance of the lens, we should choose the right lens to match with the body.

So, how should a newbie choose the right lens for him? It is recommended that beginners use the zoom kit lens in their hands first, such as 50-0mm in half-frame and 0-0mm (F0) in full-frame. After familiarizing yourself with the effects of different focal lengths, you can configure an affordable prime lens, such as 0mm, according to your needs.

In addition to these basics mentioned above, it is necessary for beginners to know some other related knowledge when buying lenses, such as aperture, image stabilization, and the difference between the original and the sub-factory. In this way, we can be more clear about our needs when choosing lenses, so that we can make a more informed choice.