IPhone XS

via Daring Fireball:

When I first started comparing side-by-side shots from the iPhone XS and iPhone X using the wide-angle lens, I noticed that the shots from the iPhone XS had a slightly larger field of view. They were a little bit wider. Look at the photos of the clown photo booth above and you can see it clearly. I didn’t move at all between those shots — both phones were roughly the same distance from the subjects, but the iPhone XS captured more of the scene. Apple confirmed to me that this is true — the iPhone XS wide-angle lens has an equivalent focal length of 26 mm. Not a lot wider, but enough to be noticeable. But when you look at the actual focal length of the lens in Photos (or any other app that can display the EXIF data of the image files), it is 4.25 mm.
0.25 mm may sound tiny but consider that the “telephoto” lens is only 6 mm. The equivalent focal length is wider, but the actual focal length is longer. This made no sense to me at first. Then I realized it would make sense if the camera sensor were a lot larger. And lo, here’s what Apple’s iPhone XS camera page says:
More low‑light detail. The camera sensor features deeper, larger pixels. Deeper to improve image fidelity. And larger to allow more light to hit the sensor. The result? Even better low‑light photos.
“Larger” is all they say. Not how much larger. That left me with the assumption that it was only a little bit larger, because if it were a lot larger, they’d be touting it, right? There are “field of view” calculators you can use to compute the sensor size given the other variables, so I used one, and by my calculations, the sensor would be over 30 percent larger.
I repeat: over 30 percent larger.
That seemed too good to be true. But I checked, and Apple confirmed that the iPhone XS wide-angle sensor is in fact 32 percent larger. That the pixels on the sensor are deeper, too, is what allows this sensor to gather 50 percent more light. This exemplifies why more “megapixels” are not necessarily better. One way to make a sensor bigger is to add more pixels. But what Apple’s done here is use the same number — 12 megapixels — and make the pixels themselves bigger. 12 megapixels are plenty — what phone cameras need are bigger pixels.
I think what makes this 32 percent increase in sensor size hard to believe, especially combined with a slightly longer lens, is that by necessity, this combination means the sensor must be further way from the lens. The basic necessity of moving the lens further from the sensor (or film) is why DSLRs are so big compared to a phone. But the iPhone XS is exactly the same thickness as the iPhone X, including the camera bump. (Apple doesn’t publish the bump thickness but I measured with precision calipers.) So somehow Apple managed not only to put a 32 percent larger sensor in the iPhone XS wide-angle camera, but also moved the sensor deeper into the body of the phone, further from the lens.

This is a huge deal.