How many meters can I enlarge by 3 times? What about five times? 10 times

5 times zoom can enlarge 150 meters.

10x zoom can enlarge 300 meters.

Digital camera: optical zoom

The English name of Optical Zoom is Optical Zoom.

Digital cameras rely on optical lens structure to achieve zoom.

The optical zoom mode of a digital camera is similar to that of a traditional 35mm camera.

It is to zoom in and out the scene to be shot through the movement of the lens.

The larger the optical zoom factor,

The farther the scenery can be photographed.

When buying a digital camera, many users will ask

What is digital zoom,

What is optical zoom? Below, we will use the chart to explain.

Optical zoom is achieved by changing the position of lens, object and focus.

When the image plane moves in the horizontal direction,

Vision and focal length will change,

The scenery in the distance becomes clearer,

It makes people feel that objects are progressive.

Obviously, there are two ways to change the perspective.

One is to change the focal length of the lens.

In photographic terms,

This is optical zoom.

The focal length of the zoom lens is changed by changing the relative position of the lens.

The other is to change the size of the imaging surface,

I.e. the diagonal length of the imaging plane. In the current digital photography,

This is the so-called digital zoom. In fact, digital zoom does not change the focal length of the lens.

Changing the viewing angle only by changing the diagonal angle of the imaging plane leads to

"Equivalent" to the effect of lens focal length change.

So we saw some digital cameras with long lenses,

The internal lens and photoreceptor have more room to move, so the zoom factor is also larger.

We see that some ultra-thin digital cameras on the market generally have no optical zoom function.

Because the root in the fuselage does not allow the movement of the photosensitive device,

Like Sony F828,

Fuji S7000 these

"Long lens" digital camera has 24 times optical zoom function.