Wesley's Tool-Box

In Korea or Japan, loud camera shutter sounds from smartphones are a fact of life due to the voluntary standards for the camera-equipped cellphones meant to ease privacy concerns. Issues had already been raised as far back as 2001 in Japan and Korean government started taking action in 2003. These standards call for a mandatory shutter sound of certain loudness even in silent mode. In Korea, sound level is set to be between 60 and 68dBA.

Note that this is not mandated by law in either countries, so there is no legal repercussion for not honouring the standards. Still, it poses an annoyance in many legitimate circumstances, something that users in other countries would never encounter. Imagine that the phone will make a loud sound whenever you take a photo or a screenshot(!) even in silent mode. There are 3rd party camera apps that try to avoid the sound, but for the screenshots you would ultimately need a system-level hack. This means jailbreaking or finding an obscure bug/feature.

I noticed that this problem has been exacerbated on the iPhone 7 series because it is using two speakers instead of one. You'll now get to hear the noisy shutter sound even louder, in stereo. To get an objective picture of the situation, I brought out my iPhone collection for a round of sound level measurement for the camera shutter sound. Here's how they stacked up.


The test was done by measuring the sound using the "Decibel 10th" app on the iPad Pro 9.7". Tested iPhone was 40cm(16") away from the iPad's microphone. To human ears, an increase of 10dB is felt as the sound being twice as loud. This means that the integrated speaker got roughly two times louder since iPhone 5 onwards. Incidentally, this would've been necessary to meet the aforementioned Korean standards. The 60dB level must be attained at a distance of 1m(3.28'), and there is a decrease of 8dB for moving from 40cm to 1m. Taken together, it becomes obvious that the iPhone 4S and earlier models wouldn't be loud enough.

And as expected, iPhone 7 I bought in Japan was the loudest, even though the second speaker was facing away from the iPad's microphone. One consolation is that the sound heard by the subject isn't much louder than before; you only hear it as being much louder because the second speaker is facing you.

Meanwhile, the iPhones bought in the United States turned out to be relatively quieter even when the volume was set to the loudest. In fact, my iPhone 7 Plus had a very quiet shutter sound even though music playing on it was quite loud in contrast. This shows that Apple is intentionally boosting the speaker output beyond normal levels when the shutter sound is made on the Korean and Japanese models. It would be difficult for those who haven't used these models to realize how loud they are.

If you want to hear the difference for yourself, here's the video of the test that the results are from. If anyone had been wondering why I still try to get iPhones from the United States, this should be the answer.

Continuing from the last post, let's look at the indoor performance of the front camera. I took photos of a table in the living room where the kids have built what's essentially a toy village with Lego blocks. It should serve to show differences in colour reproduction, if any.


With the exception of iPhone 4, the colours look more or less correct, which is good. Also, the iPhone 7 did manage to take clear photos when the objects are closer, so it's doing a good job as its intended role of a selfie camera. 6S Plus result is fuzzier, but this time it can be attributed to a slight camera shake and would likely be nearly as good as 7 but with less pixels otherwise.

Next up, I took shots of the same scene with the rear camera, once with good indoor lighting and once with faint indirect lighting so I could observe how much noise can be seen for each cases. For the darker shots, I tried to have the camera maintain at or close to ISO 800 to make a close comparison.

It is pretty safe to assume that the latest iPhone has the best camera in general. The tradition continues with iPhone 7, which allows me to take impressive photos like the one you see here. But to truly appreciate the improvements, a good round of comparison is in order.

First, let's look at the basic specifications as reported by the EXIF data. For the rear camera, we have these values:

And for the front camera:
Last year's rear camera was mostly about the increased pixel count; with the quality improvement taking a back seat. Front camera did jump out of the 1.2-megapixel hole, which was overdue. This year, enhancing the image quality is back in focus. The sensor can now capture on a much wider colour space (DCI-P3, a.k.a. Display-P3, instead of the traditional sRGB), and the wider aperture on the new rear lens (f/1.8, up from f/2.2) should allow for lower noise and brighter night shots. Meanwhile, the front camera can now take 7-megapixel photos.

Smartphone software and hardware become more sophisticated by the year. So a new device is expected to be faster than its predecessor. But it's a balancing act of both raw performance and power consumption. The A10 Fusion chip in the iPhone 7 series has four cores - two high-performance cores and two power-efficient cores to do just that. It's supposed to be the fastest A-series chip yet while not impacting battery life. So how does it really do on performance? Apple claims up to 2 times faster for CPU and 3 times faster for GPU compared to 2 generations ago (iPhone 6 series). Let's see if that's true.


GeekBench 4 Result Details: 4S | 5 | 5S | 6+ | 6S+ | 7

GeekBench has been a standared in benchmarking CPU performance across many platforms. The 4.0.1 version that came out recently runs on iOS 9 or later, so I can only compare up to iPhone 4S. Still, you can see that iPhone 7 does indeed perform well. It is about 2.1 to 2.2 times faster than iPhone 6 Plus, and 35 to 40 percent faster than iPhone 6S Plus. We no longer have 2x performance jump like back in iPhone 5 - 5S transition, but things are in line with Apple's claim here.

My iPhone collection is constantly growing. When you lay them down like this with their boxes, it provides me with a nice view of how the technology is evolving. As with all things, though, old devices simply ceases to be supported by the manufacturer. The three iPhones at the top no longer receive any major iOS version updates and are stuck in their time. The new member of this is the iPhone 4S, topping out at iOS 9.3.5. I expect iPhone 5 to join this group next year because, along with iPhone 5C, it is the last in the line of 32-bit iPhones and iOS 10 visually warns about an app that's not 64-bit.

iOS updates or not, all my devices are kept in good working condition. So I brought them out for another annual round of tests. For this year's tests, devices from iPhone 5 to 7 had iOS 10.0.1. 4S, 4, and 3GS had 9.3.5, 7.1.2, and 6.1.6, respectively. Last year, devices from iPhone 4S to 6S Plus had 9.1. Let's take a look at the boot times.


Unless it's an old device that's feeling the weight of a new OS, newer devices tend to have a quicker boot time. Strangely though, iPhone 7 does not boot up as fast as its predecessor, and this was repeatedly observed. Perhaps this is due to the tested device having a large, 256GB storage and the system taking its time to test its integrity.