Periscope Picture Download [WORK]

It just shows magnified image the whole time, depending on your haed angle, you can simply lean forward to see a more refined picture, it works more or less like a periscope does in real life. It adds a lot.

A periscope allows you to look over at objects or people from around a corner, or from a higher vantage point than normal. While modern submarines and other high-tech vehicles usually use a more complex system of prisms and lenses, the basic mirror periscope described below is easy to make at home, and provides a clear enough image that it was widely used for military purposes well into the twentieth century.[1]XResearch source

Periscope Picture Download

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Exposure is one of the key attributes for technically good pictures. The main attribute evaluated is the brightness of the main subject through various use cases such as landscape, portrait, or still life. Other factors evaluated are the contrast and the dynamic range, eg. the ability to render visible details in both bright and dark areas of the image. Repeatability is also important because it demonstrates the camera's ability to provide the same rendering when shooting several images of the same scene.

Color is one of the key attributes for technically good pictures. The image quality attributes analyzed are skin-tone rendering, white balance, color shading, and repeatability. For color and skin tone rendering, we penalize unnatural colors but we respect a manufacturer's choice of color signature.

Cameras are indispensable to phones. Ever since the first camera phone, cameras have been so central to phones' branding that many companies cash in solely on their devices' abilities to capture Pixel-perfect (pun definitely intended) photographs. Over recent years, phone makers have channeled their creative energy into improving cameras and accommodating more sensors on smartphones. The evident result is the phenomenal increase in competition between brands to offer more cameras for fewer bucks. Innovation has been the key to surviving in this competitive environment, and one camera technology that has been the epitome of innovation is periscope zoom cameras. With instant 5X or 10X optical magnification, periscopic telephoto cameras facilitate quick and easy zooming into the far-off distance.

This article talks about the uses of periscope zoom cameras, their advantages and disadvantages, and the prospective future of periscope zoom cameras. But before we start with the latest trends, here's a quick overview of what may have led to this innovation.

The concept of a periscope camera on a smartphone remained quite novel until Huawei popularized it by launching the Huawei P30 Pro in March 2019. In doing so, they became the first brand to offer it commercially. The Huawei P30 Pro, as we saw in our detailed camera review of the phone, could take shots at up to 50x magnification. However, Huawei was not the first brand to experiment with this idea -- it was OPPO that first showcased a periscopic camera's optical zooming capabilities at MWC 2017. Despite the early introduction, the technology took two years to come to a realization.

As per its textbook definition, a periscope is an optical instrument that lets anyone see around an obstacle without them being visible. It traditionally includes mirrors that reflect or prisms that refract the light at right angles, allowing people to see what's above or below their actual line of sight. Periscopes have been used in armored vehicles like tanks or submarines for several decades. The instrument itself is harmless and can also be made for some simple fun science experiments.

The application isn't much different when it comes to smartphone cameras. As opposed to standard telephoto cameras that offer 2X or 3X optical zoom, periscopic cameras typically offer 5X or 10X zoom by using more than a single lens along with the camera sensor. A periscope's role is to help accommodate the array of lenses without drastically increasing the smartphone's thickness.

To understand the role of a periscope inside a camera module, visualize the smartphone in a 3D arrangement with different axes represented by X, Y, and Z coordinates. The smartphone lies with the screen flat on the YZ plane, while its thickness can be measured along the X-axis. Traditional camera sensors and the attached lenses also lie in the YZ plane, perpendicular to the Z-axis.

In the case of a periscopic setup, however, the sensor and the lenses lie on the XZ plane and intersect the Y-axis at a right angle. At the end, opposite to the camera sensor, lies a prism that changes the direction of light perpendicular to the sensor. The use of a right-angle prism is why periscope cameras have square or rectangular cutouts instead of traditional circular ones.

Light enters through the rectangular opening for a periscope camera, is refracted at a right angle, and then passes through the lenses and reaches the sensor. To ensure that the images taken with 5X or 10X magnification are sharp, periscopic telephoto cameras are equipped with autofocus support in which the lenses move forward or backward to focus on a far off object on the sensor. This is demonstrated in the following video by Samsung:

There is another interesting and rather common utility of periscopes we see in cameras. SLR or DSLR cameras utilize mirrors or prisms to reflect or refract the light from the camera lens to the optical viewfinder. While there is no direct relation between periscopes inside SLR cameras and periscopic telephoto cameras on smartphones, we can't overrule the former may have been an inspiration for the new age optical zoom.

Telephoto cameras are those that allow optical zooming with or without a moving part. In contrast, a periscope camera is primarily an extension of a standard telephoto camera. Besides the difference in orientation, telephoto and periscope cameras can be distinguished by looking at the shape of the camera opening. In fact, the rectangular opening for the periscopic camera makes it easy to be identified apart from other types of cameras. Typical telephoto cameras, on the other hand, use standard circular openings and cannot be identified in just a glance.

Given the higher number of lenses used inside a periscopic telephoto setup, a telephoto camera has a longer focal length. Lastly, as we would see in the upcoming sections, neither telephoto nor periscope cameras at present support variable focal length but some modified solutions in the future might do so.

As we mentioned above, the Huawei P30 Pro was the first commercially available device equipped with a 5x periscopic zoom; the OPPO Reno 10X Zoom Edition followed soon after. Samsung's electromechanics also kicked off the manufacturing of these periscope camera modules in summer last year, but it took a while before they could bulk up a decent number of orders.

Long after the Huawei P30 Pro was launched, Vivo's X30 Pro (limited to China) held the baton as the "latest phone with a periscope camera" for a while but was soon replaced by the Samsung Galaxy S20 Ultra. Launched in February 2020, the Galaxy S20 Ultra also became the first smartphone to support up to 100X hybrid zoom.

The more recently launched Huawei Mate 40 series follows the same terminology as the P40 series. The Huawei Mate 40 Pro and the Mate 40 Pro+ feature dedicated periscope cameras with 5x and 10x optical zoom. The Mate 40 Pro+ also features a secondary telephoto camera, just like the P40 Pro+. The Porsche Design Huawei Mate 40 Pro RS follows the Mate 40 Pro+ and comes equipped with a 10x periscopic and a 3x telephoto camera.

As we saw above, the zooming capabilities of smartphones have evolved substantially over the last decade. Periscopic zoom cameras have set a new precedent when it comes to optical zoom on a smartphone. Their most salient advantage is that they allow you to capture a distant object or scenery very much on par with a point-and-shoot camera without any lens's actual movement. Simultaneously, the periscope's perpendicular orientation allows smartphone manufacturers to fit the camera sensor and the set of necessary lenses within the body of the smartphone without costing them too dearly in terms of thickness.

This means that digital zoom kicks in at magnification values other than those supported by a periscope camera despite the periscopic setup. For instance, if a smartphone supports 5X optical zoom, the periscopic camera will not come into action until you zoom to 5X zoom and instead continue to use the primary camera or another telephoto camera supports lesser magnification with digital zoom.

The concept of periscopic telephoto cameras is a progressive step ahead of digital zoom, but the limitation that we listed above testify to the necessity of a better solution. After being the first company to innovate periscope cameras, OPPO is now working on an advanced concept with variable focal length, which would allow variable optical zoom. In August 2020, OPPO revealed its concept of the "hybrid optical zoom" that utilizes a 7-element lens setup.

Even Apple is projected to move to periscope cameras on the iPhones by 2022. While there are still two more years to go before that happens, adopting periscope cameras on the iPhone might lead them to become much more mainstream than they are right now. Until then, we will continue tracking developments in the industry that let us see without leaping too far away from reality. ff782bc1db