Camera

The iPhone 5s continues Apple’s tradition of sensible improvements to camera performance each generation. I was pleased to hear Phil Schiller deliver a line about how bigger pixels are a better route to improving image quality vs. throwing more at the problem. I remember hearing our own Brian Klug deliver almost that exact same message a year earlier when speaking to some engineers at another phone company.

The iPhone 5s increases sensor size compared to the iPhone 5. Last week Brian dug around and concluded that the 5s’ iSight camera sensor likely uses a format very similar to that of the HTC One. The difference here is while HTC opted for even larger pixels (arriving at 4MP), Apple chose a different balance of spatial resolution to light sensitivity with its 8MP sensor.

One thing ingrained in my mind from listening to Brian talk about optics is that there is no perfect solution, everything ultimately boils down to a selection of tradeoffs. Looking at Apple/HTC vs. the rest of the industry we see one set of tradeoffs, with Apple and HTC optimizing for low light performance while the rest of the industry chasing smaller pixel sizes. Even within Apple and HTC however there are differing tradeoffs. HTC went more extreme in pixel size while Apple opted for more spatial resolution.

iPhone 4, 4S, 5, 5S Cameras
Property iPhone 4 iPhone 4S iPhone 5 iPhone 5S
CMOS Sensor OV5650 IMX145 IMX145-Derivative ?
Sensor Format 1/3.2"
(4.54x3.42 mm)
1/3.2"
(4.54x3.42 mm)
1/3.2" ~1/3.0"
(4.89x3.67 mm)
Optical Elements 4 Plastic 5 Plastic 5 Plastic 5 Plastic
Pixel Size 1.75 µm 1.4 µm 1.4 µm 1.5 µm
Focal Length 3.85 mm 4.28 mm 4.10 mm 4.12 mm
Aperture F/2.8 F/2.4 F/2.4 F/2.2
Image Capture Size 2592 x 1936
(5 MP)
3264 x 2448
(8 MP)
3264 x 2448
(8 MP)
3264 x 2448
(8 MP)
Average File Size ~2.03 MB (AVG) ~2.77 MB (AVG) ~2.3 MB (AVG) 2.5 MB (AVG)
From Brian's excellent iPhone 5s Camera Analysis post

Apple moved to 1.5µm pixels, up from 1.4µm in the iPhone 5. Remember that we’re measuring pixel size in a single dimension, so the overall increase in pixel size amounts to around 15%. Apple also moved to a faster aperture (F/2.2 vs. F/2.4 on the iPhone 5) to increase light throughput. The combination can result in significantly better photos than the outgoing 5 when taking photos in low light.

iPhone 5/5c Low Light

iPhone 5s Low Light

With the move to larger pixels, Apple has done away with its 2x2 binning mode in low light settings. The iPhone 5 would oversample each pixel after scene brightness dropped below a certain threshold to improve low light performance. The oversampled image would then be upscaled to the full 8MP, trading off spatial resolution for low light performance. The iPhone 5s doesn’t have to make this tradeoff. In practice I didn’t find any situations where the 5s’ low light performance suffered as a result. It always seemed to produce better shots than the iPhone 5.

iPhone 5/5c

iPhone 5s

Unlike some of the larger flagships we’ve reviewed lately, the iPhone 5s doesn’t ship with optical image stabilization (OIS). We’ve seen devices from HTC, LG and Nokia all ship with OIS, and have generally been pleased with the results. It’s not a surprise that the 5s doesn’t come with OIS as it’s largely the same physical platform as the outgoing 5. Still it would be great to see an Apple device ship with OIS. Perhaps on a larger iPhone.

As is always the case in space constrained camera systems, what Apple could not achieve in the physical space it hopes to make up for computationally. The 5s leverages electronic image stabilization as well as automatic combination of multiple frames from the capture buffer in order to deliver the sharpest shots each time.

Apple’s cameras have traditionally been quite good, not just based on sensor selection but looking at the entire stack from its own custom ISP (Image Signal Processor) and software. With the A7 Apple introduces a brand new ISP. Although we know very little about the new ISP, you can find references to Apple’s H6 ISP if you dig around.

Apple continues to ship one of the better auto modes among smartphone cameras I've used. I still want the option of full manual controls, but for most users Apple's default experience should be a very good one.

Capturing shots under iOS 7 is incredibly quick. Shot to shot latency is basically instantaneous now, thanks to a very fast ISP and the A7’s ability to quickly move data in and out of main memory. It’s impossible to write shots to NAND this quickly so Apple is likely buffering shots to DRAM before bursting them out to non-volatile storage.

 

The new ISP enables a burst capture mode of up to 10 fps. To active burst mode simply hold down the shutter button and fire away. The iPhone 5s will maintain a 10 fps capture rate until the burst counter hits 999 images (which was most definitely tested). Although it took a while to write all 999 images, all of them were eventually committed to NAND.

Photos captured in burst mode are intelligently combined as to not clutter your photo gallery. The camera app will automatically flag what it thinks are important photos, but you’re free to choose as many (or as few) as you’d like to include in your normal browsing view. Since all of the photos captured in burst mode are physically saved, regardless of whether or not you select them to appear among your photos, you can always just pull them off the 5s via USB.

The rear facing camera is paired with a new dual-LED True Tone flash. Rather than featuring a single white LED to act as a flash, Apple equips the iPhone 5s with two LEDs with different color tones (one with a cool tone and one with a warm tone). When set to fire, the 5s’ ISP and camera system will evaluate the color temperature of the scene, pre-fire the flash and determine the right combination of the two LEDs to produce the most natural illumination of the subject.

I’m not a huge fan of flashes, but I have to say that in a pinch the True Tone flash is appreciably better than the single LED unit on the iPhone 5. Taking photos of people with the new True Tone flash enabled produces much warmer and more natural looking results:

True Tone Flash Enabled

Even if your subject happens to be something other than a person I’ve seen really good results from Apple’s True Tone flash.

I still believe the best option is to grab your photo using natural/available light, but with a smartphone being as portable as it is that’s not always going to be an option.

I have to say I appreciate the vector along which Apple improved the camera experience with the iPhone 5s. Improving low light performance (and quality in low light situations where you’re forced to use a flash) is a great message to carry forward.

Front Facing Camera

The iPhone 5s and iPhone 5c share the same upgraded front-facing FaceTime HD camera. The front facing camera gets a sensor upgrade, also with a move to larger pixels (1.9µm up from 1.75µm) while resolution and aperture remain the same at 720p and F/2.4. The larger sensor size once again improves low light performance of the FaceTime HD camera (iPhone 5 left vs. iPhone 5s right):

Battery Life Video
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  • qristheone - Monday, September 23, 2013 - link

    If that was the case why can moto x be made in america and still make a profit? clearly apple is just raping people. Reply
  • robbie rob - Monday, September 23, 2013 - link

    I don't know where you're getting your info, but in the last year only TWO handset makers made a profit: Samsung and Apple. All others broke even or lost money. Broke even means made money, but by the time you pay everyone plus cost of manufacturing you didn't lose money - but you didn't bank any either.

    http://www.neowin.net/news/analysts-apple-and-sams...
    Reply
  • qristheone - Monday, September 23, 2013 - link

    the real probelm with these test is ios 7 has open gl 3.0 and android has it only on 4.3. most of these phones do not have android 4.3 infact i doubt that any of these phones tested had 4.3 when running it.

    for those who dont know open gl is OpenGL (Open Graphics Library) is a cross-language, multi-platform application programming interface (API) for rendering 2D and 3D computer graphics. The API is typically used to interact with a Graphics processing unit (GPU), to achieve hardware-accelerated rendering.
    Reply
  • NekoTipcat - Saturday, November 30, 2013 - link

    Well yes iOS supports oGL ES 3.0 but only the iPhone 5s's gpu supports it
    So the Real "Problem" resides on iOS 7 and iDevices as well
    Reply
  • whatsa - Tuesday, September 24, 2013 - link

    Nice
    As its all about apps - lol
    it would be more interesting to see the performance gain there
    as it will be many years before you see a native 64bit majority in the store.
    even though the tests bode well for the future everyday usage it will be the
    more generic apps that define its performance "today"
    Reply
  • lhlan - Wednesday, September 25, 2013 - link

    Section on A7 dual core vs quadcore design: you emphasized the A7's power efficiency advantage (lack of proper power gating on quad-core parts), as well as performance neutral factor - two cores at full speed is not slower than quad-core at so-so speed! A reference to the CPU section of MotoX review was made to back-up this point.

    Closer investigation of the MotoX review shows different picture: while performance can be comparable at best, the argument on power efficiency is so in favour of quad-core! It says running two cores at full high speed requires "ton of voltage", while running four core at 1.2GHz doesn't need that much power, hence more power efficiency.

    In the end, do we have empirical evidence as to which design (two vs. four) saves more power?
    Reply
  • 128bit - Thursday, September 26, 2013 - link

    First time knows that IPhone 5s comes with 1570 MAh battery.

    Anand ur the best keep the good job
    Reply
  • rogekk - Thursday, September 26, 2013 - link

    may pick myself up one after reading this review coupled with is african view about the iphone

    http://techjaja.com/the-reviews/iphone-5s-review/2...
    Reply
  • newandroidfan - Saturday, September 28, 2013 - link

    Tired of reading big ass reviews? Never get the info you need the most? Read the full review of the iPhone 5s and iPhone 5c with Full phone specifications only here http://goo.gl/QrGSPo Reply
  • anxyandy - Monday, September 30, 2013 - link

    Hmm! If this beauty is as good as it looks here, I'm afraid I won't even be considering the iPhone 5S! http://versus.com/en/sony-xperia-z1-mini-vs-apple-...
    Xperia Z1 Mini - same(ish) size, excellent features and hardware!
    Reply

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