There will be a lot of consumer DV "Optical Zoom" How many times, and "digital zoom" feature dozens or even hundreds of times, and even a lot of business with "digital zoom several times to convince customers to buy a poor model performance We analyze the digital or DV digital zoom and optical zoom called the difference.
The basic principle of optical zoom
Optical zoom is the zoom DV camera itself, the zoom will not be too general, most of the 8 times to 12 times, and some models up to 30 times or more points. In general, the more professional models, the high price or a good model will not have much optical zoom capability, not in optical zoom lens can not do great, but no matter what lens, zoom range is too large, but its performance is poor, so in order to ensure that the lens image quality, optical zoom lens range generally will not do much, DV's more than 20 times optical zoom lens is not much.
Advantages of optical zoom
We use DV, if by pressing the zoom button to see from the front of the lens zoom lens moves back and forth to change the focus groups, and will see in the image on the LCD screen size changes occur, this process is the zoom. This zoom lens is entirely part of the optical lens to complete, although in the course of the zoom lens aperture can vary, but the images obtained by the optical zoom is basically non-destructive, and will not reduce image clarity. But because the lens structure, size and cost of production constraints, not a great zoom range.
The basic principle of the digital zoom
On the "Zoom" two real, the optical or digital zoom to get the basic effect is the same, the popular talk is to screen "zoom" or "narrowing" process. But digital zoom is done by the digital zoom circuit, which works into the digital zoom, the lens portion of the lens fixed and, as it has been in the "telephoto" status, or that in a fixed focal length state, from inside the machine The digital circuit according to the selected zoom image zoom, this "deal" will give up some selective data or images to form a digital zoom, zoom factor the greater the drop, the more data, the resulting is likely to be very clear picture. Therefore, the number of (digital) zoom is a lossy zoom, it will generate code image mosaic phenomenon, significantly reducing image clarity, and the zoom factor greater clarity to reduce more.
Therefore, the digital zoom can not say no avail, but no practical use, therefore, can be ignored when buying digital DV (digital) zoom function.
The basic principle of optical zoom
Optical zoom is the zoom DV camera itself, the zoom will not be too general, most of the 8 times to 12 times, and some models up to 30 times or more points. In general, the more professional models, the high price or a good model will not have much optical zoom capability, not in optical zoom lens can not do great, but no matter what lens, zoom range is too large, but its performance is poor, so in order to ensure that the lens image quality, optical zoom lens range generally will not do much, DV's more than 20 times optical zoom lens is not much.
Advantages of optical zoom
We use DV, if by pressing the zoom button to see from the front of the lens zoom lens moves back and forth to change the focus groups, and will see in the image on the LCD screen size changes occur, this process is the zoom. This zoom lens is entirely part of the optical lens to complete, although in the course of the zoom lens aperture can vary, but the images obtained by the optical zoom is basically non-destructive, and will not reduce image clarity. But because the lens structure, size and cost of production constraints, not a great zoom range.
The basic principle of the digital zoom
On the "Zoom" two real, the optical or digital zoom to get the basic effect is the same, the popular talk is to screen "zoom" or "narrowing" process. But digital zoom is done by the digital zoom circuit, which works into the digital zoom, the lens portion of the lens fixed and, as it has been in the "telephoto" status, or that in a fixed focal length state, from inside the machine The digital circuit according to the selected zoom image zoom, this "deal" will give up some selective data or images to form a digital zoom, zoom factor the greater the drop, the more data, the resulting is likely to be very clear picture. Therefore, the number of (digital) zoom is a lossy zoom, it will generate code image mosaic phenomenon, significantly reducing image clarity, and the zoom factor greater clarity to reduce more.
Therefore, the digital zoom can not say no avail, but no practical use, therefore, can be ignored when buying digital DV (digital) zoom function.
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