How Important Is A Phone Camera Sensor?

 When looking at the sensors in smartphones and the iPhones 1-inch 1/2.55, because these are generally fixed-lens models, you have to pay far more attention to what else is provided by a camera. There are other specs in a smartphone camera that contribute to the picture quality, like sensor, pixel size, and lens.   

A good camera phone with a larger sensor will catch more light and produce better photos. A bigger camera sensor will collect more light, creating better pictures in general.    

Putting too many megapixels on the sensor, however, reduces pixel size. As a result, even a 13MP camera with a smaller sensor may still beat a 8MP camera with a larger sensor. You will find the trend for smartphone cameras is towards larger sensor sizes.    

Some cameras with smaller sensors are able to squeeze more top-end features in without going crazy on price. Smaller sensors are physically smaller than their larger counterparts, which allows them to fit into thinner devices such as smartphones, not needing huge camera bulges. In terms of surface area, the inch-sized sensors in an enthusiast point-and-shoot, such as Sonys RX100, are over six times larger than those of any top smartphone camera, and consumer DSLRs have sensors that are about 19 times larger.   

You will notice the trend of smartphone cameras on iPhones: The iPhone 11 Pro Max has a 1.4um pixel size, and the iPhone 12 Pro Max has a sensor with 1.7um pixels. The iPhone 13 Pro Max has an even larger 1.9um pixel size, making it perhaps one of the best camera phones available today. Obviously, the bigger the pixels, the more real estate they take up on the sensor.    

This makes it easier to compare the sensor size of one camera with that of another. At the fundamental level, sensor size dictates how much light a camera has to work with in creating an image. The larger a cameras sensor, the more light it is capable of collecting, improving image sharpness, creating less noise, and producing better-quality blur in bokeh.    

The number one predictor if a camera is going to perform well in low-light conditions is the size of its digital image sensor. Based on MAPS, we see that cameras with much smaller image sensors, such as phones or compact cameras, would perform less well on all these measures. In other words, if you were to compare two smartphones with identical sensors, a 12MP camera phone might have better light sensitivity, and thus better-looking pictures, with less noise, compared to a camera with twice as many pixels.    

At their highest F numbers, when aperture is closed down to its lowest point, even the leading DSLR cameras on the market, with their default kit lenses, generally have lens resolutions 9 times worse than their image sensors. Even the best lenses are limited in their resolving power by diffraction, which occurs when light passes through a smaller aperture in order to fall onto the picture plane, like a cameras sensor.    

Cited Sources

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• https://gavletsoalo.medium.com/fact-megapixels-arent-as-important-on-your-phone-as-you-think-3f86e053efdf 5
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