Discussed since 1647, invented in 1854, widely used in the World Wars, periscopes are making a headline comeback right now, because Apple is bringing a periscope camera in one of its iPhone 15 devices. Namely, that’s the iPhone 15 Pro Max. The non-Max Pro version will not implement this camera technology, as there is not enough space on the regular-sized device. Why do periscopes take more space? Keep reading.
Before we embark on this technical trip, let’s highlight why that’s a game changer for Apple’s camera game: the periscope lens system gives users greater natural (optical) zoom capabilities that are far superior to the digital zoom (e.g. cropping and enlarging from the main lens).
Apple calls the periscope design in the iPhone 15 Pro Max “an innovative tetraprism design” and adds that there’s also a combined optical image stabilization and autofocus 3D sensor-shift module, Apple’s most advanced stabilization system yet. The tetraprism catches the light from the lens, reflects it four times through the glass structure and by making it travel for longer, it in fact creates the needed separation between the lens and the sensor for the zoom magic to happen. If all of this sounds complicated, don’t be afraid, just keep on reading and we’ll explain it in the simplest of terms.
In the simplest of terms, think of it as a special lens system that gives you extra optical zoom capabilities. Typically, optical zoom is achieved by moving a lens element further from the image sensor – the more you want to zoom in, the further that element has to go. But of course, nobody wants a phone with a huge lens module sticking out. A periscope system solves this using a non-standard design and lens alignment: sideways. Thus it gives you ‘real’ optical zoom instead of digital zoom. The difference is huge, but let’s talk it over again.
Digital vs. optical zoom
Before the introduction of secondary (and tertiary, or more) camera setups, there was only one camera on the back of a standard phone. It was sort of a swiss-army knife tool: it was used for indoor, outdoor shots, portraits, snapshots, literally everything. Every now and then, though, users had to take a photo of something that’s either distant or small. That’s when one learns about the digital zoom pain: as you enlarge your image from the single-camera setup, quality degrades and artifacts bloom. That, in a nutshell, is digital zoom. You take a picture, clip out the surroundings of your subject, and enlarge what’s left of the image. Cropping out of a picture with a higher megapixel count produces better results, but still, it’s nowhere near as good as optical zoom.Optical zoom is quite different. Yes, no doubt it too leads to deteriorating picture quality, but it’s far subtle and overall incomparable with digital zoom. Like the name suggests, optical zoom is possible because of optical alterations in the lens itself. Again, for the magic to happen, there are physical limitations and prerequisites: the front element of the lens has to be positioned further away from the sensor (the sensor is where your scene is captured and turned from light to zeros and ones, which is turned by the device as a beautiful image on your screen).
The best example of a gadget with optical zoom capabilities is your mom’s point and shoot camera. Remember the lens on that compact thing used to protrude? Now, with some extreme exceptions (we’ll list them below), phone manufacturers are not fascinated with the idea of producing a device with a 4 inch tube, sticking out of the back that has to extend and retrieve non-stop. That’s why brands resort to implementing telephoto capabilities with periscope cameras. They save space and don’t turn your phone into a mutant.
How does the periscope camera work?
TL;DR: Periscope cameras use a prism/mirror combo to reflect light 90 degrees and send it through lens elements onto the sensor. It’s used for magnification purposes.
If you can stomach a teardown of the iPhone 15 Pro Max when it becomes available, you’ll get to see what’s so special about a periscope camera: first of all, often it has a rectangular front element (which you can see even without the device being disassembled), unlike the other cameras (they’re circular). The iPhone 15 Pro Max, however, features a circular front element lens, not a rectangular. Very exotic.
Notable models with periscope cameras
Before we talk about some notable phone models putting in use the periscope camera system, as promised, here are the optical zoom monsters with protruding camera-like zoom lenses. Since you don’t see that design at all these days, you can safely assume they didn’t perform well at all (at least in US and Europe) in terms of sales and popularity. We’re talking about Samsung’s Galaxy K Zoom and the Galaxy S4 Zoom. Both devices offered 10x optical zoom lenses (24-240mm in terms of standard 35mm equivalent), xenon flashes, optical image stabilization and Samsung glass. Different sensors were put in the two devices, so there was a difference in the megapixel count: 16 vs 20.7 megapixels total.
The first mainstream device to embody a periscope camera is Huawei’s P30 Pro (2019), which brought to the table remarkable zoom capabilities. However, some remember the ancient times, and specifically 2004, when the Sharp 902 phone (which had 2x optical zoom) appeared and the internet claims it was the first mobile phone to incorporate a periscope technology in its camera setup. That’s impressive, given that the first camera phone had hit the market only a few years earlier.
Today the landscape is filled with periscopes. One can choose between Samsung Galaxy S23 Ultra (or the S22 Ultra, for that matter), Google Pixel 7 Pro (or the Pixel 6 Pro), Honor Magic5 Pro, OPPO Find X6 Pro and others.
And now, you get one in Apple’s newest maxed-out flagship: the iPhone 15 Pro Max. Choose wisely!
Source: Phone Arena