What kinds of camera lenses are there?

Camera lenses are divided into zoom, fixed focus and magnifying glass.

First, zoom

That is, the focal length is variable, that is, the lens can be pushed and pulled. It can be understood as a lens with only a fixed focal length, only a focal segment, or only a field of view.

Second, fixed focus

1. Wide-angle lens: Generally, the lens below 35mm is a wide-angle lens, and the lens below 28mm is an ultra-wide-angle lens. Wide-angle lens has a wide angle of view, a strong sense of depth, and the scenery will be deformed, which is more suitable for shooting larger scenes, such as buildings and gatherings.

2. Medium focus lens: Generally, lenses from 36mm to 134mm are medium focus lenses. The medium focus lens is close to people's normal perspective and perspective, and the deformation of the scene is small, so it is suitable for taking portraits, landscapes, tourist commemorative photos and so on.

3, telephoto lens: generally higher than 135mm lens is telephoto lens, also known as telephoto lens. Among them, the lens larger than 300mm is a super telephoto lens. The telephoto lens has small viewing angle, weak perspective and small scene deformation. Suitable for shooting things that are inaccessible, such as wild animals and stages. It can also be used to blur the background and shoot portraits.

Step 3: Magnifier

Magnifier is a kind of lens that can increase the optical zoom factor of camera. If the optical zoom factor is not enough, you can add a magnifying glass in front of the lens. The calculation method is as follows: Put a 2-fold magnifying glass on a 4-fold optical zoom digital camera, then the optical zoom multiple of this digital camera will be changed from 4-fold to 8-fold, but the corresponding effective aperture will be reduced. For example, a 2-fold magnifying glass will reduce the effective aperture by 2 times. However, most of the corresponding lenses can still be shot under autofocus.

Key points of camera lens purchase:

1. Understand the types of lenses: Common types of lenses include standard lenses, wide-angle lenses, telephoto lenses, macro lenses and so on. Each lens has different characteristics and uses, so you need to choose the right lens according to your own photography needs.

2. Know the focal length and aperture of the lens: When choosing a lens, you need to know the focal length and aperture. The focal length determines the depth of field that the lens can shoot, that is, the range of clarity before and after the picture. The longer the focal length, the shallower the depth of field, that is, only the area around the focal length will remain clear, and other parts will be blurred. The shorter the focal length, the deeper the depth of field, that is, more areas will remain clear.

3. Consider brand and price: Different brands of lenses may have different characteristics and advantages and need to be selected according to their own needs and budgets. In terms of price, generally speaking, higher quality lenses cost more. However, not all high-priced lenses are suitable for you. You need to make a choice according to your shooting needs and budget.