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Hãy viết đoạn tóm tắt về nội dung bằng tiếng việt kích thích người mua: Samsung Galaxy S24 Phones Have a New Zoom Trick to Get That Close-Up Photo

Samsung’s Galaxy S24 phones and other recent smartphones have a new way to squeeze better camera technology out of all those pixels on high-resolution image sensors. That’s the part of your phone’s camera that actually records that sunset or your kid racing down the soccer field.

A few years ago, your smartphone probably had a 12-megapixel image sensor that took 12-megapixel images. But that direct relationship is getting looser, which is why an Apple iPhone 15 Pro shows a 2x camera option without actually having a dedicated 2x camera.

I call the technology “crop zoom,” and I’m a big fan of the approach. It’s not a gimmick.

It’s slowly bringing us some of the photographic versatility you get from a traditional camera with a zoom lens. To improve photographic flexibility, phones are sprouting additional cameras — the Samsung Galaxy S24 Ultra has four cameras on the back and a selfie cam on the front — but crop zoom gives you more photo options without more camera hardware. That means it can help you out, whether you own a flagship phone or a more modest model.

Samsung is using the technology in its newest Galaxy phones announced Wednesday. All the S24 models have a 50-megapixel main camera that’ll shoot lower-resolution shots at 2x zoom. And the Galaxy S24 Ultra has a new 50-megapixel 5x telephoto camera that’ll shoot 12-megapixel shots at 10x zoom, too.

Cameras have become the single most important feature on smartphones. Photos can be precious, and we can share them immediately with friends and family to bring them into the moment. Smartphone makers spend more time describing cameras than any other new feature, camera lenses have become showy bulges on the backs of our phones, and high-end phones have more and more cameras to cover more shooting situations.

You may have been warned about the empty promises of digital zoom, a pixel magnification technology that’s far less useful than the optical zoom that requires either a new camera module on a smartphone or a zoom lens on a traditional camera. Crop zoom is somewhere in between digital and optical zoom: a feature, not fakery.

Here’s a look at how the technology works, why it’s a good idea, and the situations where you need to be careful with crop zoom.

How does crop zoom photography work?

You’re probably familiar with cropping a photo, which simply means paring away the outer parts of a frame to concentrate attention on the important part of a scene. Crop zoom is the same thing, but it happens on the image sensor when you’re framing and taking a photo, not afterward while you’re editing.

What makes crop zoom useful now are all the new high-resolution image sensors cropping up in flagship phones. You often have so many pixels to start with that you can still get a usefully detailed shot even if you use crop zoom and eliminate a lot of those pixels.

For example, with Apple’s iPhone 14 Pro and 15 Pro models, the main camera can take 48-megapixel photos at 1x zoom. But you can also select 2x zoom, which takes a 12-megapixel shot with pixels just in the center of the sensor. That’s way cheaper than building a separate 2x camera hardware.

Google’s Pixel 8 Pro takes this a step further. Like the iPhone 15 Pro, it has a 5x telephoto camera. You can use it to take 50-megapixel photos. But Google also lets you use crop zoom to shoot a 12-megapixel 10x photo — essentially, getting twice as close but with just a quarter of the resolution. That’s the same approach in the Samsung Galaxy S24 Ultra.

What are the shortcomings of crop zoom?

Cropping to use a smaller portion of an image sensor significantly reduces image quality. A bigger image sensor captures more detail, better color and a broader dynamic range between light and dark than a smaller image sensor taking the same shot.

If there’s plenty of light, crop zoom is fine, and the technology works well enough for me to use it a lot. When it’s dim, lower your expectations accordingly. Your smartphone camera will run into its limits a bit sooner.

That said, crop zoom to get you from 1x to 2x zoom takes place on a phone’s main camera, typically the one that has the largest and best image sensor with the fastest lens. So you’ll likely have more leeway for crop zoom there than with telephoto cameras.

Crop zoom isn’t like optical zoom on a traditional camera, where the full width of the sensor is used regardless of your zoom settings. That’s an area where traditional cameras still have a big image quality advantage over smartphones.

Where’s crop zoom technology headed?

We’ve had crop zoom for a couple years now, but expect it to spread and improve.

Lower-end phones will get it as high-resolution sensors become more affordable. Telephoto cameras could benefit from sensor and lens improvements too.

One notable trend is a greater disconnect between the native resolution of a sensor and the resolution of the photos that come from it.

Apple’s iPhone 15 Pro phones get not just 1x and 2x options from its 48-megapixel main camera, for example, but also 1.2x and 1.5x settings enabled by crop zoom. That’s the equivalent of 28mm and 35mm lenses in old-school SLR terms, compared with the 1x camera at 24mm. But all of them are 24-megapixel photos, which means Apple is massaging the final image with some image processing to convert the number of original pixels.

With even higher-resolution sensors, smartphone makers could get even more latitude. Don’t expect the continuous, fluid adjustment of traditional cameras. But crop zoom is a big step toward that flexibility.

And I’d like to see more of it. Hey, Apple, how about a 10x camera option on the iPhone 16 Pro later this year?

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