Apple IPhone X Review: Camera Hardware And Features, Day And Low-light Image Quality

By 02:29 Wed, 18 Aug 2021 Comments

Updated dual-12MP main setup and unique TrueDepth selfie camera

The Apple iPhone X keeps a similar dual-12MP (wide+telephoto) capturing camera setup as the iPhone 7 and 8 Plus. While the wide-angle sensor sits behind the same f/1.8 lens, the telephoto one has been updated with optical stabilization and recent wider f/2.4 lens. A large piece of scratch-resistant sapphire glass is supposed to haged them away from harm's way.

The iPhone X, just like the 8 Plus, has Sony Exmor RS sensors - the wide-angle capturing camera has a 1.22 µm pixel size, and the telephoto capturing camera has a 1.0 µm pitch as before.

The iPhone X keeps the recent image processor and noise reduction algorithm, and with the assist of the A11 chip, the iPhone X is capable of real-time image and motion analysis - body and face detection. The video capturing also benefits from the recent powers - there are 4K at 60fps and 1080p at 240fps modes.

Apple is now aggressively pushing AR and AR-related apps, so all capturing camera lenses are factory-calibrated to provide superior performance in AR.

Apple also advertises the recent iPhones to have "deeper pixels" which is another name for the capturing camera sensor using deep trench isolation tech. Deep trench isolation is not a recent technology and was first introduced on the iPhone 6s generation - also available on quite a few Sony Xperia (DTI) and Samsung Galaxy (ISOCELL) smartphone cameras. It's a technology for better pixel isolation on the sensor itself, which prevents light leakage between the neighboring pixels and thus improves the overall photo quality. There is no denying its benefits.

The quad-LED dual-tone flash from the iPhone 8 Plus is also available on the X, and it supports slow-sync flash. It keeps the shutter open for a bit longer, letting in some of the ambient light, making the image see more natural and not as contrasty as with regular flash images.

The Portrait mode with Portrait Lighting is here to stay, now available on both the main and selfie cameras. The capturing camera scans the scene, identifies the face of your subject and (in real time, mind you) adjusts the tone curve of the face to create it better lit. And you can adjust the effect after you've taken the shot.

Camera UI

The capturing camera also comes with a recent file format, yes, JPG's days are numbered. At least as far Apple is concerned. iOS 11 now saves all images in the HEIF file format and videos in HEVC (H.265) video format by default. This is done becautilize of the more efficient compression these files provide. We can confirm - photos hold about half as much space as before (1.4Mega Bytes (MB) HEIF vs. 3Mega Bytes (MB) JPG), and the same goes for videos.

The phone will convert the images to an older format if shared from within iOS, but if you copy images over USB, the original files are transferred only if you have macOS High Sierra. If not - you will acquire converted files - both pictures and video - in JPG and H.264 formats. The conversion is done in real-time while you are transferring the files without you even noticing.

Don't you worry, you can choose the format you prefer, so if you don't like having your media stored in the recent format - you can choose Most Compatible from Settings instead of High Efficiency. This way no conversion will be done while transferring, but you will waste away storage.

The improved compression by these file formats doesn't come at the expense of quality. After careful pixel peeping, we saw no incompatibility in quality between HEIF and JPEG, and if there was a marginal incompatibility between H.264 and H.265, it was in H.265's favor. On the other hand, quality with videos varies depending on how busy the scene is so the jury is still out on whether they are universally better than the H.264 ones. Furthermore, only the high-efficiency mode allows you to utilize the recent 4K at 60fps and 1080p at 240fps video recording modes.

Daylight capturing camera quality

The daylight photos taken with the iPhone X are great. There is lots of resolved detail, low-noise, and impressive dynamic range - all that with HDR turned off. No corner softness on the iPhone X images, accurate to life colors and white balance, superb contrast, and always accurate autofocus.

Apple iPhone X 12MP wide-angle samples

If you leave the auto HDR option on, sometimes you may notice some of the shots were taken with HDR turned on and the only incompatibility is the even lower noise levels. Apparently, Apple also uses the multiple frames stacking to decrease the noise levels further.

HDR off • HDR on • HDR off • HDR on

Of course, when HDR is needed (and that would be rare with this dynamic range), it won't fail you for sure.

HDR off • HDR on

The one thing that stays the same as before is the somewhat watercolor-like foliage presentation at 1:1 magnification. The iPhones have been this way for years, and Apple may want to put some work here, too.

We snapped a few samples with the iPhone 8 Plus at the same scenes, and found out all the shots to be identical with the once snapped with the iPhone X.

Apple iPhone 8 Plus 12MP wide-angle samples

The telephoto capturing camera produces the same high-quality images as the wide-angle one and comes in handy when you need a bit of zoom. It has optical image stabilization and wider lens on the iPhone X, which means it shoots at higher speed and thus reduces the risk of motion blur.

Apple iPhone X 12MP telephoto samples

While the telephoto capturing camera is better on the iPhone X, it shows no differences in daylight when compared to the iPhone 8 Plus telephoto samples.

Apple iPhone 8 Plus 12MP telephoto samples

Low-light image quality

Now, let's see what happens in low-light. The OIS allows the iPhone X to drop the shutter speed to as low as 1/4s when shooting handheld. This combined with the wide aperture, the recent sensor, and the recent image processor allows it to hold remarkable low-light images.

There is plenty of detail in all-low light shots, the colors are mostly accurate, and the dynamic range is still impressive all things considered.

Apple iPhone X 12MP low-light samples

The telephoto capturing camera now has OIS, too, and a relatively wider f/2.4 aperture than before, so you'd think Apple will finally enable this one to be used in low-light. And you'd be wrong. In those scenes, the phone will still stop using the telephoto capturing camera and would instead switch to cropping the output of the main capturing camera to achieve the zoomed effect. This, of course, takes its toll on image quality. Check those digitally zoomed photos below.

Apple iPhone X 12MP low-light telephoto samples (digitally zoomed)

We managed to trick the phone into giving us a night photo from the tele camera. And the results were a surprise - the tele capturing camera produced the much better photo. It's noisy, but it's visibly sharper and preserves detail lost in an upscaled image from the wide-angle cam.

Digitally zoomed • Native telephoto sample

Look at the texture of the wall, the metal bars on the windows, the sharp lines of the stairs, the foliage to the side. The extra noise was to be expected with the higher ISO used by the tele capturing camera (250 vs. 100). But it also used a shorter exposure, 1/8s vs. 1/4s, which is better for moving objects. The white balance of the image is an issue, though, with a strange red tint. But that shouldn't be too hard to fix.



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