Zoom lens price

The zoom lens can change different focal lengths, which is equivalent to multiple fixed-focus lenses and is very convenient to use. The convenience of zoom lens makes it used by more and more people, and more and more people want to buy zoom lens. What about the price of zoom lens? Let's take a look with Bian Xiao.

Price of zoom lens

The price of zoom lens is mainly affected by lens use, focal length range, minimum aperture and other factors. The price of zoom lens varies in the market, but it is mainly in three ranges. Cheap zoom lenses are generally less than 5000 yuan, slightly better ones are between 5000 yuan and 10000 yuan, and those above 10000 yuan are more expensive, but they are also better zoom lenses.

Use of zoom lens

When using zoom lens to focus, it is best to adjust the image to the maximum position first; In other words, the longest focal length end of the lens is used for focusing. Then, reduce the focal length to the desired focal length when shooting. In this process, the images of all focal lengths are always clear. Using this technology, it is easier to observe whether the image details are clear because it focuses on the image as large as possible, so it is also the most accurate focusing method. Note that some zoom lenses need to rotate two independent control rings, one ring controls the focal length and the other ring controls the focal length.

Zoom lens principle

Optical zoom is to change the position, length and angle of focus by moving the lens inside the lens, so as to enlarge and reduce the image. In the above picture, the longer right angle side of the red triangle is the focal length of the camera. When the position of the focal point changes, the focal length will also change. For example, if the focus moves in the opposite direction to the imaging plane, the focal length will be longer and the viewing angle in the picture will be smaller. In this way, the scene in the viewing angle will become larger on the imaging plane.

In the past, photographers used to choose different lenses to shoot different things, but the emergence of zoom lenses greatly facilitated photographers, who could shoot a variety of things with only one lens, which not only saved the expenses of photographic equipment, but also saved the time of changing lenses.