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A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a
A periscope lens, sometimes called a folded lens, is a mechanical assembly of lens elements that uses a prism
PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies. The program is also known by the SIGAD . PRISM collects stored internet ...
or mirror
A mirror, also known as a looking glass, is an object that Reflection (physics), reflects an image. Light that bounces off a mirror forms an image of whatever is in front of it, which is then focused through the lens of the eye or a camera ...
to redirect the light through the lenses with a 90° angle to the optical axis
An optical axis is an imaginary line that passes through the geometrical center of an optical system such as a camera lens, microscope or telescopic sight. Lens elements often have rotational symmetry about the axis.
The optical axis defines ...
, as in a periscope
A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.
In its simplest form, it consists of an outer case with ...
.
Uses
The Kenworthy/Netman Snorkel Camera System, introduced in 1967 by Norman Paul Kenworthy and Bob Nettman, uses periscope lenses to allow filming very smallscale models
Scale or scales may refer to:
Mathematics
* Scale (descriptive set theory), an object defined on a set of points
* Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original
* Scale factor, a number ...
and objects from a very close distance.
Smartphones use periscope lenses to allow larger zoom ratios without increasing their thickness significantly. The increased optical zoom range is aimed to improve macro photography
Macro photography (or photomacrography or macrography, and sometimes macrophotography) is extreme close-up photography, usually of very small subjects and living organisms like insects, in which the size of the subject in the photograph is g ...
. 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. 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. In 2019, the Huawei P30 Pro featured a 5x zoom periscope lens. In 2020, the Huawei P40 Pro+
Huawei Technologies Co., Ltd. ("Huawei" sometimes stylized as "HUAWEI"; ; zh, c=华为, p= ) is a Chinese multinational corporationtechnology company in Longgang, Shenzhen, Longgang, Shenzhen, Guangdong. Its main product lines include teleco ...
introduced a 10x zoom periscope lens camera.
See also
*List of longest smartphone telephoto lenses
This is a list of smartphones with a telephoto lens that offers a focal length (35 mm equivalent) of at least 100 mm or "4× optical zoom" with an imaging area equivalent to a 1/3.5″ (inches) or larger sensor.
Smartphone lenses are often market ...
References
Telescopes Film and video terminology {{Film-term-stubSee also
* Folded optics *List of longest smartphone telephoto lenses
This is a list of smartphones with a telephoto lens that offers a focal length (35 mm equivalent) of at least 100 mm or "4× optical zoom" with an imaging area equivalent to a 1/3.5″ (inches) or larger sensor.
Smartphone lenses are often market ...