Even if you're a photography enthusiast, the sensor size in your smartphone camera is probably the last thing you'd think to check.
Here's a quick explanation of the topic — and why it matters so much to the quality of your photos.
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In a digital camera, the sensor is the digital panel that light strikes in order to create the image. It serves as the electronic equivalent of film in traditional cameras.
The larger the sensor, the more light it can capture and the more pixels it can accommodate — which means better results in low-light conditions and higher overall image quality.
A Full Frame sensor is one whose dimensions match those of a film frame: 36 × 24 mm.
Cameras with a full-frame sensor tend to be relatively large and expensive.
In most cameras you'll encounter, the sensor will be smaller — these are known as Crop Sensors.
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What's remarkable about smartphone cameras is the results they deliver despite their exceptionally small dimensions.
Take the camera sensor in the iPhone 16 Pro, for example.
It uses a Sony IMX 903 sensor measuring 1/1.14-inch — just over 22 mm.
It manages to produce excellent results even in low-light conditions, and for the average user it delivers far better images compared to a standard camera.
That high quality is achieved through highly sophisticated software processing, combined with the merging of multiple simultaneous exposures to construct the final image.
In this way, the smartphone effectively compensates for the physical limitations of its sensor by enhancing the input through software.
This is precisely why smartphones from different manufacturers will produce different results, even when using the exact same camera sensor.
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One more interesting point to close with:
The larger the surface area of the sensor exposed to light, the shallower the depth of field in the resulting image.
This means a full-frame sensor will produce a more blurred background compared to a smaller sensor.
This effect is known as "bokeh," and it is extremely popular in portrait photography.
For this reason, portrait photographers will generally prefer to pay more and invest in a camera with a full-frame sensor.
In the photo — a pair of mirrorless cameras, one with a Full Frame sensor and one with a Crop Sensor.
In the diagram — a size comparison of common Crop Sensor formats.
Images credit: Video School