Traditional Culture Encyclopedia - Photography and portraiture - How to use optical zoom?
How to use optical zoom?
So what is the difference between optical zoom and digital zoom? Digital zoom means that a digital camera uses its own image processing system to cut a small piece on the sensor, add pixels through interpolation and forcibly enlarge it. What's the point? Isn't it the same if you enlarge the picture on the computer yourself? Therefore, digital zoom should be called digital magnification, which is not a real magnified image obtained through the change of lens focal length, and the more magnified, the less clear the image quality is. Therefore, some indicators should not be considered when buying a camera.
Theoretically, when distant objects are photographed at close range, the image quality will not be damaged. But it is actually a loss, and the main factors are: dust, air and stability. Dust will cause the light emitted by the target object to diffuse, and air may cause the light to refract, which will affect the imaging quality. The farther you shoot, the less clear and gloomy the picture is. There is also the stability of the camera, because the camera will shake slightly if it is far away, which can be solved by tripod and short shutter time.
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