What is door viewer?

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What is door viewer?

Door viewer is commonly known as cat’s eye. It is a small optical instrument installed on the door of a residential house to facilitate residents to observe the outdoor situation, which has become a necessity for home security. When the light refracts through it, it looks like the light of the Persian cat’s eyes at night, so it is also called cat’s eye.
Different door viewer suppliers offer different door eye viewer prices, which are mainly related to materials and processes, such as antique brass door viewer and antique copper door viewer have a higher price than normal brass or copper door viewer. Consumers can choose according to their needs.
Composition
Like the telescope and the microscope, the door mirror consists of an objective lens and an eyepiece. The objective lens is a concave lens, and the eyepiece is a convex lens, but the focal length of the objective lens is short, the focal length of the eyepiece is long, and the focal length of the eyepiece should be equal to or longer than the sum distance of the objective lens and the eyepiece (the length of the cat’s eye) and the focal length of the eyepiece, which is about 3cm.
Effect
Looking out of the room through wide angle door viewer, you can see all the scenes in the range of about 120 degrees outside the door, but you can’t see anything in the room through the door mirror. If you install this mirror on the door of a public house or a private apartment, it will play a certain role in the anti-theft and safety of the family.
Crack
The anti-cat eye, commonly known as the “anti-cat eye viewer”, is a device that can clearly view inside through the cat’s eye. Most households are equipped with security doors, but some security doors have some space on the outside of the cat’s eye, which has no cover. In this case, the anti-cat eye observation mirror can be multiplied. The main purpose of “anti-cat eyes” is to “peep voyeur.”
Under natural light, everything in the room can be seen through the anti-cat eye, whose weight is very light, and whose lens barrel is small. Its palm can be covered completely, and it can be placed on a belt, a pocket or a vest, or it can be buckled on the key chain.
Using the opposite principle of cat eye imaging, the built-in lens sequence is changed for ‘reverse view’. You can directly observe the indoor situation from the cat’s eye outside the door. You can also take pictures of your home by connecting your camera and monitor.

suppliers offer different door eye viewer prices, which are mainly related to materials and processes, such as antique brass door viewer and antique copper door viewer have a higher price than normal brass or copper door viewer. Consumers can choose according to their needs.
Composition
Like the telescope and the microscope, the door mirror consists of an objective lens and an eyepiece. The objective lens is a concave lens, and the eyepiece is a convex lens, but the focal length of the objective lens is short, the focal length of the eyepiece is long, and the focal length of the eyepiece should be equal to or longer than the sum distance of the objective lens and the eyepiece (the length of the cat’s eye) and the focal length of the eyepiece, which is about 3cm.
Effect
Looking out of the room through wide angle door viewer, you can see all the scenes in the range of about 120 degrees outside the door, but you can’t see anything in the room through the door mirror. If you install this mirror on the door of a public house or a private apartment, it will play a certain role in the anti-theft and safety of the family.
Crack
The anti-cat eye, commonly known as the “anti-cat eye viewer”, is a device that can clearly view inside through the cat’s eye. Most households are equipped with security doors, but some security doors have some space on the outside of the cat’s eye, which has no cover. In this case, the anti-cat eye observation mirror can be multiplied. The main purpose of “anti-cat eyes” is to “peep voyeur.”
Under natural light, everything in the room can be seen through the anti-cat eye, whose weight is very light, and whose lens barrel is small. Its palm can be covered completely, and it can be placed on a belt, a pocket or a vest, or it can be buckled on the key chain.
Using the opposite principle of cat eye imaging, the built-in lens sequence is changed for ‘reverse view’. You can directly observe the indoor situation from the cat’s eye outside the door. You can also take pictures of your home by connecting your camera and monitor.

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