What is a periscope lens?

Introduction: With the development of digital technology, digital technology has appeared among us. As camera technology gradually matures, professional photographers have higher and higher requirements for lenses, so periscope lenses have been produced. Periscope zoom lenses are commonly known as internal zoom lenses. Since the optical zoom is completed inside the fuselage, so Filters can be easily attached without the need for additional lens barrels. Secondly, since the movement of the bellows is avoided, the internal zoom camera can effectively prevent dust from being sucked into the lens. What is a periscope lens?

Periscope lenses were developed to create thinner digital cameras with optical zoom, because for general digital cameras with optical zoom telescopic lenses, the body must have enough The depth of the zoom lens assembly makes it difficult to further slim down the body. Later, the design of periscope lenses appeared, which converted the depth required by the zoom lens into a vertical or horizontal position to achieve the purpose of reducing the thickness of the body. Digital cameras using a periscope lens do not extend outward when zooming, and the zoom is achieved through the inner rotation of the lens.

Advantages:

1. The characteristic of the periscope lens in imaging is that there is not much difference in sharpness between the center and the edge, allowing the fineness of the picture to be well balanced.

2. Convenient and compact, this is obvious.

3. It is good for the industrial design of the camera appearance. Generally, cameras using periscope lenses have a more beautiful appearance.

In addition, many digital cameras with external zoom, especially high-magnification lenses, have to extend out of the body for a long time. Once the camera is turned on, it is easy to damage the lens if there is a bump. However, with internal zoom, ?The camera basically does not need to worry about such a situation happening. Since the length of the lens barrel is fixed, it can be sealed very easily, so the sealing performance will be better. Nowadays, many cameras with internal zoom have achieved "three-proof" or even "four-proof", namely dustproof, dropproof, waterproof (even submersible) and pressureproof.

Disadvantages:

1. As the lens decreases, the aperture and photosensitive element area will also decrease accordingly, and it cannot suppress dispersion very well. The quality is relatively poor, so there are no records of high-end DC using periscope lenses.

2. The zoom speed is not fast enough, and it is difficult to achieve a large aperture due to structural limitations.