iPhone 5s Camera Loses to Point-and-Shoot in Low Light
Beyond the hubbub about a fingerprint sensor that works on various other body parts, the big news about the iPhone 5s (starting at $199 with a two-year contract) is its new camera. Instead of squeezing in more megapixels, Apple chose to use bigger pixels to catch more light when illumination is scarce, and it added a novel flash meant to better match the natural lighting in a shot.
Those improvements may make the iPhone 5s' camera stronger when competing with other smartphone cameras, but it still doesn't measure up to even a midrange point-and-shoot when the lights go low, as we found in a series of tests. The point-and-shoot is a dying product category. Why carry another piece of gear when you already have a camera in your pocket? For most people, a cellphone camera is good enough. But, in low light, at least, the iPhone is still no match for a "real" camera.
The challenge of dark photos
It's hard to take a bad picture when light is plentiful. A blue sky or a bright room gives a camera all it needs — plenty of data with which to make a photo. It's when light is scarce that a camera shines — or not. A sensor has to efficiently harvest all the photons it can, and an image processor has to take that fuzzy goop of data and make it pretty.
To see how the iPhone 5s stacks up, we put it against a $180 Canon PowerShot Elph 330 HS. That choice wasn't random. Apple made a big deal about the size of the pixels in its new sensor: 1.5 microns (thousandths of a millimeter, or about 0.000039 inches) across. As tiny as that sounds, it's 15 percent bigger than the pixels in the iPhone 5, and it puts the 5s camera in the range of point-and-shoots. The 330 HS comes very close, with pixels measuring 1.54 microns. We viewed the photos on a 13-inch MacBook Pro with Retina display, and we judged the quality at the sizes you would see on a smartphone screen or a site like Facebook.
We subjected both cameras to some miserable conditions — the terrace of a café at night and a group shot in a dimly lit conference room. In most of these conditions, the point-and-shoot was the clear winner. Both cameras were tested with their default settings, except that the iPhone 5s camera was set for high dynamic range (HDR) photos — a bonus feature that should be given a chance.
In the shot we took with the Canon at the café, not only was a woman sitting in front of the window brightly lit, but the window was crystal clear, affording an almost equally bright view of the interior. In the photo taken with the iPhone 5s, she appeared to be in a shadow, and the window was so grayish and fuzzy that it looked dirty.
Shooting over the terrace to the street was a challenge for both cameras. Everyone and everything looked like the subjects of a bad Monet. But the Canon's photos were noticeably less fuzzy. It also handled points of lights from streetlights and porch lights fairly well, showing them as fuzzy circles, rather than the fuzzier circles emitting streaks of light in the iPhone 5s photos. That streaking effect is called lens flare and results in smaller cameras that lack a barrel that is long enough to diminish the intensity of stray or especially bright light before it reaches the sensor. Antireflective lens coatings can also help reduce lens flare.
One clear benefit of the iPhone 5s' camera is the auto white balance. Its photos didn't have the yellowish tint that we saw in most of the Canon pictures. That was enough to let it win one test — a photo of a cup and silverware on a tiled table. The white cup, napkin and patterns in the tile all looked true to life, while they were rather yellowish in the Canon photo.
But you rarely take photos of cups. You take photos of your friends. Here too, you're much better off with the Canon. We found that by photographing three officemates — with a Benetton-style range of skin tones — in a poorly lit room.
Shooting with no flash, the Canon still captured a surprising amount of color — a bit too much, as the faces came out a bit ruddy. But the iPhone 5s, even in its high-dynamic range mode (which helps it bring out dark features), produced a dim image with a grayish pallor.
Not surprisingly, the iPhone 5s did much better with the flash enabled. This phone camera has a special flash, possibly the first of its kind. It features two LEDs — one with an orangey or "warm" tone and one with a bluish or "cool" tone (known as color temperatures). By blending the two, the flash system is intended to adjust the color temperature to the surroundings. Our room had a slight "warm" look from overhead lights, and the dual flash did fit it well, rendering natural skin tones.
But it simply wasn't bright enough. Even when the flash was used, the iPhone 5s' photos still looked grayish. The Canon's photos, on the other hand, were a bit too bright, with some features overexposed, but they were also more detailed and colorful, which we think made up for it. Since picture modes are a key feature of point-and-shoot cameras, we did try one: slow synchroflash. This feature allows the camera to pick up some of the ambient lighting before the flash fires, and it resulted in a pleasing photo with a warmer tone and fewer overexposed parts.
Do you still need a point-and-shoot?
Smartphone cameras are radically better than they were a few years ago. New sensor technology allows them to produce much brighter photos even without a flash, and better flashes have helped even more. Apple's two-tone flash is a further step forward.
But our tests showed that smartphone cameras still aren't quite up to par when used in the most challenging conditions: dark environments. Our Canon test unit's photos were crisper and brighter and, ultimately, more pleasant-looking. And no matter how good Apple makes its iPhone camera in the future, it will probably not fit in the 10X optical zoom that the Canon 330 HS packs.
If you own an iPhone 5s and want to get the best pictures, you'll need to pack a point-and-shoot. But if you don't want the extra baggage, you'll get photos that are good enough.