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A true zoom lens or optical zoom lens is a type of parfocal lens, one that maintains focus when its focal length changes. [1] Most consumer zoom lenses do not maintain perfect focus, but are still nearly parfocal. Most camera phones that are advertised as having optical zoom actually use a few cameras of different but fixed focal length ...
This is a list of smartphones with a telephoto lens that offers a focal length (35mm equivalent) of at least 100mm or "4× optical zoom" with an imaging area equivalent to a 1/3.5″ or larger sensor. Smartphone lenses are often marketed in terms of "optical zoom" [1] relative to the phone's main camera. For example, 120mm is usually referred ...
Plastic optical fiber (POF) or polymer optical fiber is an optical fiber that is made out of polymer. Similar to glass optical fiber, POF transmits light (for illumination or data) through the core of the fiber. Its chief advantage over the glass product, other aspect being equal, is its robustness under bending and stretching.
For the example of glass (n S ≈ 1.5) in air (n 0 ≈ 1.0), this optimal refractive index is n 1 ≈ 1.225. [20] [21] The reflection loss of each interface is approximately 1.0% (with a combined loss of 2.0%), and an overall transmission T 1S T 01 of approximately 98%. Therefore, an intermediate coating between the air and glass can halve the ...
Optical radiation is the part of the electromagnetic spectrum with wavelengths between 100 nm and 1 mm. [1] [2] This range includes visible light, infrared light, and part of the ultraviolet spectrum. [3] Optical radiation is non-ionizing, [4] and can be focused with lenses and manipulated by other optical elements.
A sphere with radius R 1 is chosen as the object to be hidden. The cloaking region is to be contained within the annulus R 1 < r < R 2. A simple transformation that achieves the desired result can be found by taking all fields in the region r < R 2 and compressing them into the region R 1 < r < R 2. The coordinate transformations do not alter ...
Another application of acoustic-optical deflection is optical trapping of small molecules. AODs are essentially the same as acousto-optic modulators (AOMs). In an AOM, only the amplitude of the sound wave is modulated (to modulate the intensity of the diffracted laser beam), whereas in an AOD, both the amplitude and frequency are adjusted ...
Inexpensive J-K 16 mm optical printer using a Bolex camera. An optical printer is a device consisting of one or more film projectors mechanically linked to a movie camera. It allows filmmakers to re-photograph one or more strips of film. The optical printer is used for making visual effects for motion pictures, or for copying and restoring film ...
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