Periscope lens explained

A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a prism or mirror to redirect the light through the lenses with a 90° angle to the optical axis, as in a periscope.^{[1] [2] [3] [4]}

Uses

The Kenworthy/Netman Snorkel Camera System, introduced in 1967 by Norman Paul Kenworthy and Bob Nettman, uses periscope lenses to allow filming very small scale models and objects from a very close distance.^{[5] [6]}

Smartphones use periscope lenses to allow larger zoom ratios without increasing (too much) their thickness. The increased optical zoom range is aimed to improve macro photography. With a periscope lens, the zoom lenses are turned by 90° and are aligned along the length or the width of the smartphone instead of its depth.^[7] The Sharp 902, released in 2004, is sometimes credited to be the first mobile phone to feature a (2x variable zoom) periscope lens camera. The Asus ZenFone Zoom smartphone, released in 2015, used an Hoya dual-periscope lens mechanism to achieve a 3x zoom.^[8] In 2019, the Huawei P30 Pro featured a 5x zoom periscope lens. In 2020, the Huawei P40 Pro+ introduced a 10x zoom periscope lens camera.^[9]

See also

• List of longest smartphone telephoto lenses

See also

• Folded optics
• List of longest smartphone telephoto lenses

Notes and References

1. Book: Samuelson, David . Hands-on Manual for Cinematographers . 2014-03-26 . CRC Press . 978-1-136-04474-8 . 208 . en.
2. Web site: 2020-11-27 . What is the Difference Between a Periscope and Telephoto Camera? . 2023-07-20 . XDA Developers . en.
3. Web site: Peter . Counterclockwise: periscope cameras are old news, optical zoom dates back to 2004 . 2023-07-20 . GSMArena.com . en-US.
4. Web site: 2020-04-10 . Galaxy S20 Ultra Shows Off Samsung's Prowess in Mobile Photography . 2023-07-31 . Counterpoint Research . en-US.
5. Web site: Paul Kenworthy . 2023-07-20 . D23 . en-US.
6. Web site: 2018-05-01 . ICG Magazine - May 2018 - The Action Issue by ICG Magazine - Issuu - page 36 . 2023-07-20 . issuu.com . en.
7. Sun . Wen-Shing . Liu . Yi-Hong . Tien . Chuen-Lin . June 2023 . Optical Design of a Miniaturized 10× Periscope Zoom Lens for Smartphones . Micromachines . en . 14 . 6 . 1272 . 10.3390/mi14061272 . 37374857 . 2072-666X . free . 10305347 .
8. Web site: P . Daniel . 2015-02-10 . Asus ZenFone Zoom to come with HOYA lens: the world's thinnest optical zoom unit . 2023-07-20 . Phone Arena . en-US.
9. Web site: Huawei P40 Pro+ review . 2023-08-08 . GSMArena.com . en-US.