Why does the new iPhone 11 Pro have 3 cameras? – gpgmail


On the back of the iPhone 11 Pro can be found three cameras. Why? Because the more light you collect, the better your picture can be. And we pretty much reached the limit of what one camera can do a little while back. Two, three, even a dozen cameras can be put to work creating a single photo — the only limitation is the code that makes them work.

Earlier in today’s announcements, Apple showed the base-level iPhone 11 with two cameras, but it ditched the telephoto for an ultrawide lens. But the iPhone Pro has the original wide, plus ultrawide and telephoto, its optical options covering an approximate 35mm equivalents of 13mm to 52mm, and 26mm.

“With these three cameras you have incredible creative control,” said Apple’s Phil Schiller during the stage presentation. “It is so pro, you’re going to love using it.”

Previously the telephoto lens worked with the wide-angle camera to produce portrait mode effects or take over when the user zooms in a lot. By combining the info from both those cameras, which have a slightly different perspective, the device can determine depth data, allowing it to blur the background past a certain point, among other things.

The ultra-wide lens provides even more information, which should improve the accuracy of portrait mode and other features. One nice thing about a wide angle on a dedicated sensor and camera system is the creators can build in lots of corrections so you don’t get crazy distortion at the corners or center. Fundamentally you’ll still want to back off a bit, because using an ultrawide lens on a face gives it a weird look.

While we’re all used to the pinch-to-zoom-in gesture, what you’re usually doing when you do that is a digital zoom, just looking closer at the pixels you already have. With an optical zoom, however, you’re switching between different pieces of glass and, in this case, different sensors, getting you closer to the action without degrading the image.

One nice thing about these three lenses is that they’ve been carefully chosen to work together well. You may have noticed that the ultra-wide is 13mm, the wide is twice that at 26mm, and the telephoto is twice that at 52mm.

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The simple 2x factor makes it easy for users to understand, sure, but it also makes the image-processing math of switching between these lenses easier. And as Schiller mentioned on stage, “we actually pair the three cameras right at the factory calibrating for focus and color.”

Not only that, but when you’re shooting with the wide camera, it’s sharing information with the other two cameras, so when you switch to them, they’re already focused on the same point, shooting at the same speed and exposure, white balance, and so on. That makes switching between them mostly seamless even while shooting video (just be aware that you will shake the device when you tap it).

Apple’s improvements to the iPhone camera system this year are nowhere near as crazy as the switch from one to two cameras made by much of the industry a couple years back. But a wide, tele, and ultra-wide setup is a common one for photographers and no doubt will prove a useful one for everyone who buys into this rather expensive single-device solution.


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This charming little camera prints instantly to receipt paper – gpgmail


I’m a big instant camera fan, but the film is expensive and the digital printers just aren’t very good. So I was delighted to see this alternative seeking funds on Kickstarter: the Alulu camera, which prints photos in black and white on receipt paper. Why did no one do this before?

The idea is so simple that you’ve already gotten it — no explanation necessary, but since explaining things is my job I am going to do so anyway.

The Alulu is an idea incubated by three friends as they left college, each heading their separate directions but looking to take a shot at making this cool gadget a reality before doing so. Right now it only exists in prototype form (they only thought it up in May), but it works more or less as intended, and it’s as silly and fun as I wanted it to be; I got to test one out, as it happened that one of the team members happened to live in my neighborhood.

The camera is a little box about the size of a fat point-and-shoot, with charming little dials on the top to select exposure mode or a 10-second timer if you want it, and a shutter button that’s hard to miss. On the side is the charge port and a button to advance the paper. And the back has a little frame that flips out and helps you set up your shot — very loosely, I hardly need add.

Inside the 3D-printed, acrylic-plated exterior, the guts of the camera are simple. An off-the-shelf camera stack that does all the hard work of actually taking a picture — but don’t worry about the megapixels, because they don’t matter here. The camera sends its signal to a custom board that prepares and optimizes the image for black-and-white printing.

To be clear, we’re talking black and white, not shades of grey. The printer inside the camera is a standard receipt printer, which uses heat-activated ink that’s either transparent or black and nothing in between. You feed paper in via a little chamber on the bottom.

alulu

Thankfully creating the appearance of shading in 1-bit imagery is old hat for computer graphics, and an algorithm dithers and tweaks the picture so that more or fewer dots in various patterns create the illusion of a wider palette.

The results are… well, photos printed on receipt paper. Let’s keep our expectations in line. But they’re instantly printed (with a little stutter like a dot matrix printer) and charming little artifacts indeed. You can even use receipts you’re given at stores or restaurants, if they fit, and you can always fold it over a bit if it’s too large.

receiptrow4receiptrow2

(By the way, if you’re worried about being poisoned by receipt paper, don’t be. The stuff with high BPA content was generally phased out a while back, and you can order non-poisonous rolls of paper easily and cheaply.)

I think this thing is great, though I’m afraid that the projected $99 retail price might be too high for what amounts to a novelty. The idea, I was told, was to drive the price down with mass manufacturing, but until they do so they want to be honest about the cost of the parts (the printer itself is the most expensive piece, but like everything else the price goes down when you order a thousand or more).

Whether it makes it to the factory or not, I think the Alulu is a great idea. We need more weird, one-off devices in this world of ours where every function seems to devolve to the smartphone — and I’m tired of my phone! Plus, it can’t print on receipt paper.

The Alulu is currently looking for backers on Kickstarter. Go give it a pledge.


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