How to use the focusing and zooming functions of digital SLR camera

Start using. However, there are still some confusing places, one of which is zooming and focusing.

Although there is only one word difference, the concepts of zoom and focus are completely different. The purpose of zooming is to change.

The angle of imaging. In other words, zooming can make objects closer and farther. And focusing is to make the focus clear.

But it has nothing to do with "closer".

I wonder if you have ever used a projector? If you have used it, you will be impressed. The projection lens of the projector is provided with

Two adjustable rings, one can adjust the size of the projection screen, and this process is "zooming". And adjust to the appropriate size.

When I was young, the picture was likely to be blurred. At this time, you need to turn around again to make the picture clear. This is "focus".

In fact, any digital SLR has autofocus, but the zoom of digital SLR is wrong. Because, numbers

The angle of view that a SLR camera can present is completely determined by the lens. For the whole digital SLR system, the digital SLR ontology (through

Usually called the fuselage) and the lens are two parts. Generally, when buying, the price of the fuselage and lens is calculated separately (of course not

Less entry-level digital SLR also has the case that the body and lens are sold in sets, which is called setting machine). If you give a digital SLR,

Using fixed-focus lens, digital SLR can't "zoom in and out" and the viewing angle is fixed. If you put on a large zoom lens,

Head, then the digital SLR is easy to have the ability to zoom in and out. It is for this reason that in numbers

There is no zoom button on the SLR.

Different from small digital cameras. Fixed focus lens? Of course there is no focus ring!