What is the difference between optical zoom and digital zoom

Digital zoom is to enlarge a part of the photo, zooming in the camera is the same as zooming in on the computer.

Optical zoom is like a telescope, moving the lens to magnify the object.

The specific differences between the two are as follows:

1. The optical zoom of the camera depends on the optical lens structure to achieve zooming, that is, the lens to be moved is used to zoom in and out of the scene to be photographed. The larger the optical zoom factor, the more distant the scene can be photographed. The optical zoom of the current home video camera is between 10x and 25x, which can clearly capture things 70 meters away.

2. The digital zoom of the camera is actually an electronic enlargement of the picture, which enlarges a part of the pixels on the original CCD image sensor to the entire picture. For example, there are four small dots that do not fill the entire picture. Through electronic zooming, the four small dots are enlarged separately to fill the entire picture. That is to say, through digital zoom, the scene is enlarged, but its sharpness is reduced, so digital zoom is too large and has no practical significance. The digital zoom of current camcorders ranges from 44x to 600x, but in actual use, 40x is sufficient.

3. If the zoom magnification is not enough, you can add a magnifying lens in front of the lens, such as 2, 0X magnifying lens can increase the original 20x optical zoom to 40 times, 3, 0X magnifying lens can increase To 60 times.

4. If the angle of view is too small, for example, if you want to take a certain scene on the same screen, and you can't go back to adjust the shooting range of the lens, you can achieve this by adding a wide-angle lens in front of the lens. The wide-angle lens of 0 and 5X can increase the range to twice the original one.

5. The UV lens is a very transparent glass piece. It is installed in front of the lens for a long time to protect the lens from impact and dust from entering the lens. For related models, see the UV protection lens, wide-angle lens, and multiplier lens.