For example, the optical zoom factor of the card machine on the market at present is amazing, but the SLR is indifferent. Please explain it to the master, thank you!

There are many optical zooms of 20 times and 30 times in the card machine, but the effect of the telephoto end is very poor. SLR pays attention to image quality, and there are few lenses with zoom 10 times or more. Even if there is, the quality of telephoto end is better than that of card machine, but it is not ideal. SLR has a special fixed-focus telephoto lens, such as 600mm focal length, often tens of thousands or even hundreds of thousands of yuan.

Therefore, it is not recommended to excessively pursue the so-called large zoom of the card machine.