What is a zoom camera?

The focal length varies within a certain range, and different wide-angle and narrow-angle field of view can be obtained. Camera lenses with different imaging sizes and different scene ranges are called zoom lenses. When the lens object distance is certain, as the lens focal length increases, the picture range of the monitoring scene seen on the monitor at the end of the system will become smaller, but the picture details will become clearer; and as the lens specifications increase, the picture range of the monitoring scene seen on the monitor at the end of the system will become larger, but the picture details will become blurry.

In what industries can optical zoom cameras be used in
Among them, the zoom camera is divided into electronic zoom and optical zoom. Electronic zoom is actually to continuously expand the image. Since the focal length remains unchanged, the size of the image on the CCD will not change, so the clarity of the photographed object will become blurred as it expands. Digital zoom has no practical significance. Simply put, it's like taking a screenshot on a computer and enlarging the screenshot. Your image is still so many pixels, so the more screenshots are enlarged, the less clear it will be.

Optical zoom is generated by changing the position of the lens, object and focus. When the imaging surface moves horizontally, the field of view and focal length will change, and the further the scenery will be clearer, making people feel that the object is gradual. Therefore, there are definitely two ways to change the viewing angle. One is to change the focal length of the lens and change the focal length of the lens by changing the relative positions of each lens in the zoom lens; the other is to change the size of the imaging surface, that is, change the diagonal length of the imaging surface.

The zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very conducive to picture composition. Since a zoom lens can double as multiple fixed-focus lenses, the biggest feature of the zoom lens is that it realizes the function of changing the lens focal length at will. Unlike a fixed-focus lens, a zoom lens does not rely on quick lens change to achieve changes in the lens focal length, but rather changes in the lens focal length by pushing or rotating the lens's zoom ring. Within the zoom range of the lens, the focal length can be changed steplessly, that is, any focal length within the zoom range can be captured, which creates conditions for achieving diversified composition.

When focusing with a zoom lens, it is best to first consider adjusting the picture to the maximum focal length for focus; use the longest focal length end of the lens for focus. Then, reduce the focal length to the expected focal length when shooting. During this process, the effects of all focal length changes are always clearly visible. Since you focus on the largest picture as possible, it is easier to observe whether the details of the picture are clear, so it is also the most accurate way to focus. Zoom cameras have a wide range of applications and can be used in industries, medical care, intelligent security, drones, robots and other fields.