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Optical zoom and digital zoom are among the technologies that have a great impact on the quality of a photo or video. In this article, let’s find out what optical zoom and digital zoom are and what’s the difference!
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What is Optical Zoom?
Optical zoom is composed of many different layers of lenses, when we adjust the zoom in or out, there will be a mechanical change of the lens, the focus of the camera, helping the camera to see farther than usual but the image is still clear. strokes .
Optical zoom changes the image based on the camera’s hardware , giving the image a magnified but still very realistic definition. The lenses with optical zoom capabilities are most commonly found today on dedicated cameras (DSLRs) or on current high-end smartphones.
Optical zoom across devices will provide the same results, but depending on the quality of the camera’s glass that may affect that result.
What is Digital Zoom?
Digital zoom (also known as digital zoom), just like optical zoom, digital zoom still zooms in on objects but doesn’t require too much mechanical or lens elements.
It will essentially crop the areas around the scene to make it look like you’re getting closer to the subject. The rest of the image is enlarged by an algorithm , hence the name digital.
Digital zoom is currently developing quite strongly, thanks to its convenience, low cost and thriving technology, used not only on cameras but also on smartphones with impressive zoom capabilities.
The quality of digital zoom is also being significantly improved compared to before in the integration of AI intelligence, when zooming in or out, AI will automatically adjust the image for clarity.
Compare optical zoom and digital zoom
Image quality
The image quality between optical zoom and digital zoom has a clear difference, optical zoom has better image quality, the image is not broken and blurred.
The reason is that for optical zoom, the focal point is adjusted by moving the optical lens back and forth and the displayed image is enlarged accordingly. Therefore, there is almost no loss in image quality.
The image quality on digital zoom is not too high, meaning some data will be lost during zooming. The algorithms will add pixels to keep details in the image when zoomed in, but not so perfectly.
Zoom ability
Because digital zoom works by processing algorithms, the zoom size of cameras with numerical zoom is much higher than optical zoom. However, in return the image quality is reduced compared to the original.
In addition, optical zoom has the ability to adjust the lenses to change the optical focus so that the camera can zoom further than usual.
Zoom time
Due to the mechanical structure, the time to optical zoom until the image can be clearly displayed will be a little longer than the arithmetic zoom with the mechanism of processing by an algorithm.
Price
Optical zoom is much more expensive than digital zoom due to its small structure and special manufacturing technology.
Popularity
Digital zoom was a selling point in the early days of digital cameras, but over time, camera manufacturers focused less and less on this spec, instead focusing on optical zoom. is increasingly developing.
Optical zoom is also brought to smartphones, recently featured (as of June 2020) is the OPPO Reno 10x Zoom of the OPPO Reno series with 10x optical zoom capability or Huawei P30 Pro with 5x optical zoom capability.
However, digital zoom is also gradually returning thanks to the impressive zoom capabilities equipped by manufacturers on phones such as Samsung’s Galaxy Note 20 Ultra (zoom to 50x), Galaxy S20 Plus (zoom to 100x), in addition, many other smartphone models also support digital zoom such as Vivo’s V20, OnePlus 8 Pro 5G, Galaxy Z Fold2 5G,…
summary
Each type of zoom will have different advantages and disadvantages , specifically:
Digital zoom is cheap, popular, large zoom size and easy to upgrade and update through software. However, the image quality drops noticeably at maximum zoom.
Meanwhile, the optical zoom is smaller in size than the arithmetic zoom, and the image quality remains the same after zooming. Its minus point is that it is difficult to upgrade and update due to its physical structure and high cost.
Compare optical zoom and digital zoom:
| STT | Comparative characteristics | Optical zoom (Optical zoom) | Digital zoom (Digital zoom) |
| first | Image quality | Stay the same when zooming in | Image tank when zoomed in |
| 2 | Zoom size | Limits (due to physical structure, fixed parameters) | Unlimited (due to the use of algorithms) |
| 3 | Zoom distance | Distant | Distant |
| 4 | Focus time | Long time (due to mechanical construction, wait for the focal length to change) | Fast |
| 5 | Impact object | Directly into the camera lens | Image |
| 6 | Price | High | Short |
| 7 | Popularity | Few (due to high cost) | Many (cheap cost, easy to upgrade) |
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