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Periscope Lens
Are you interested in a periscope telephoto lens technology manufacturer in China? Welcome to our website, we are one of the best China periscope telephoto lens technology manufacturers. If you need this Lens, welcome to contact us.
Periscope lens used in mobile phones has become a hot spot.
So what is a periscope lens?
As the name suggests, the periscope lens draws on the basic principle of periscope.
1. What is the basic principle of periscope?
A periscope refers to a device that stretches out from under the sea to spy on activities on the sea. Its structure is the same as that of an ordinary ground telescope, except that two mirrors are added to make the object light reflect twice and turn to the eye. Periscope is often used in submarines to observe the enemy's situation on the sea.
Periscope mainly uses two reflectors to make the light path fold. The design and function of this folded optical path are very important, and it is also the main reason for its use in mobile phones.
2. Why isn't the zoom of the periscope lens too powerful?
The basic assumption of the current imaging lens is the aperture imaging model, and the imaging position is near the focus of the lens.
Under this basic assumption, if the object is close, it needs a short focal length lens to image; If the object is far away, it needs a long focal length lens to image, so that the same physical shot can be of the same size.
Therefore, if you want to take a clear picture of things in the distance, you need a long focal length.
Another problem is that the thickness of mobile phones is limited! Therefore, the focal length cannot be too long.
Therefore, to make the focal length as long as possible, the simplest way is to raise the camera.
Because when the camera is raised, it can accommodate a longer focal length lens.
However, now the pursuit of shooting farther requires a longer focal length! The camera can't be more convex!
So the periscope lens is used on the mobile phone!
3. Why can periscope lenses have a longer focal length? Or how does the periscope lens work?
First, we designed a periscope lens according to the principle of the periscope at the beginning.
This design is the same as the periscope, and the light path is folded.
Then, if the folded light path is expanded equivalently, what will it look like?
After the optical path is equivalently expanded, the equivalent focal length can be much greater than the thickness of the mobile phone itself.
Of course, you don't have to install two reflectors. If you install a reflective prism, the position of the sensor can be adjusted accordingly.
In addition, the lens can also be installed behind the reflective prism.
Why is the periscopic telephoto lens so popular with mobile phone manufacturers?
A periscopic telephoto lens is becoming the standard configuration of flagship phones, and various brands of mobile phones have brought periscopic 5x optical zoom. So the question is, why is the periscopic telephoto lens so popular with mobile phone manufacturers?
As we all know, because smartphones are beautiful and thin, the use of telescopic zoom lenses affects the thickness and reliability of the whole machine, so internal zoom is the best way for mobile phones to achieve optical zoom. Its structure is different from the traditional lens arrangement. The camera that was originally vertically arranged is horizontally arranged in the mobile phone, and a movable special optical prism is used to refract light and realize imaging. Such a design will not make the phone very thick, and can greatly increase the focal length.
The advantage of a periscope camera is that it can greatly increase the focal length, which can make up for the lack of internal zoom and achieve a professional camera level.
"Periscopic telephoto lens" is not a simple "dazzling technology" of mobile phone manufacturers, but can solve many of our actual needs for taking photos of scenes, such as concerts and landscape photos. Through the telephoto lens on the sensor, the mobile phone can take distant scenes without mechanical zoom.
In addition, a telephoto lens is also more used to take photos in portrait mode. By combining the data of multiple lenses, the mobile phone sensor can know the distance of the photographed object, and then blur the background with the object as the focus.
