Astronomy:Periscope lens
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.[2] 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.[3] The Asus ZenFone Zoom smartphone, released in 2015, used an Hoya dual-periscope lens mechanism to achieve a 3x zoom.[3][8][9] In 2019, the Huawei P30 Pro featured a 5x zoom periscope lens.[2] In 2020, the Huawei P40 Pro+ introduced a 10x zoom periscope lens camera.[10]
See also
References
- ↑ Samuelson, David (2014-03-26) (in en). Hands-on Manual for Cinematographers. CRC Press. pp. 208. ISBN 978-1-136-04474-8. https://books.google.com/books?id=jaXWAQAAQBAJ&pg=PA208.
- ↑ 2.0 2.1 2.2 "What is the Difference Between a Periscope and Telephoto Camera?" (in en). 2020-11-27. https://www.xda-developers.com/periscope-camera-vs-telephoto-camera/.
- ↑ 3.0 3.1 3.2 Peter. "Counterclockwise: periscope cameras are old news, optical zoom dates back to 2004" (in en-US). https://www.gsmarena.com/counterclockwise_periscope_cameras_are_old_news_optical_zoom_dates_back_to_2004-news-36053.php.
- ↑ "Galaxy S20 Ultra Shows Off Samsung's Prowess in Mobile Photography" (in en-US). 2020-04-10. https://www.counterpointresearch.com/galaxy-s20-ultra-shows-off-samsungs-prowess-in-mobile-photography-and-zoom-technology/.
- ↑ "Paul Kenworthy" (in en-US). https://d23.com/walt-disney-legend/paul-kenworthy/.
- ↑ "ICG Magazine - May 2018 - The Action Issue by ICG Magazine - Issuu - page 36" (in en). 2018-05-01. https://issuu.com/icgmagazine/docs/may2018/36.
- ↑ Sun, Wen-Shing; Liu, Yi-Hong; Tien, Chuen-Lin (June 2023). "Optical Design of a Miniaturized 10× Periscope Zoom Lens for Smartphones" (in en). Micromachines 14 (6): 1272. doi:10.3390/mi14061272. ISSN 2072-666X. PMID 37374857.
- ↑ (in en) Asus Zenfone Zoom Review: Optical Zoom! (at 1:09), https://www.youtube.com/watch?v=rOn_hKoBs28, retrieved 2023-07-20
- ↑ P, Daniel (2015-02-10). "Asus ZenFone Zoom to come with HOYA lens: the world's thinnest optical zoom unit" (in en-US). https://www.phonearena.com/news/Asus-ZenFone-Zoom-to-come-with-HOYA-lens-the-worlds-thinnest-optical-zoom-unit_id65810.
- ↑ "Huawei P40 Pro+ review" (in en-US). https://www.gsmarena.com/huawei_p40_pro_plus-review-2120.php.
See also
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