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WHY OPTICAL ZOOM IS BETTER THAN DIGITAL ZOOM ?

 

OPTICAL VS DIGITAL ZOOM

You have had read or being told that optical zoom is better than the digital ones. Yes they are, and you want to know why, how and in what way, this article tells you the difference between them, without the jargon.

 

OPTICAL ZOOM

 

Optical zoom is about Physical Lens, much like using a magnifying glass, by pulling away the magnifying glass from your subject, your subject appears magnified. Note, there is a "Physical Distance" involve here between the subject and the magnifying glass ( we will come to this later ), and this is the vary basis of magnification for telescope, microscope, camera lens etc... that enables zooming in with rich details of far away objects possible, like the planets, moons and the stars.

 

DIGITAL ZOOM

We know that a digital picture is made up of dots call pixels, every pixel display a color, put all these pixels together and they form a coherent image that is meaningful to the human.
In digital zoom, the size of every pixel is simply increase by computer processing to make the picture appears larger, remember the total number of pixels are finite, therefore the detail of the picture is the same, and the pixels were merely augmented to create an effect of a larger picture.

 

PHYSICAL DISTANCE

Remember the earlier mentioned "Physical Distance" required for optical zoom magnification, this is the domain digital technology has yet to emulate, or else we will not need giant Hubble telescopes to search the sky, or cameraman using monster long lens on sports field to capture zoom-in actions.

The vary fact that you have to pull away lens to create magnification give you the idea how much can lens inside the confined space of a mobile phone pull away to magnify, very little, thus in phone or camera with short lens, once the optical zoom max out, digital zoom takes over to pull off the zooming effect.

 

 

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WHY OPTICAL ZOOM IS BETTER THAN DIGITAL ZOOM ?