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Pinhole (optics) — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Pinhole_(optics)
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-15T15:36:23.360Z
SHA-256 of the archived text: e470e04c521844b58f278d6d1d2346b2a8880d8413d0a363781bc8e48663b637
Stable URL of this page: https://metraipolis.com/documento/dc_fd66ea2cdaf3

How to cite

Pinhole (optics) — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Pinhole_(optics) (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_fd66ea2cdaf3 (Metraipolis archive dc_fd66ea2cdaf3, sha256 e470e04c521844b58f278d6d1d2346b2a8880d8413d0a363781bc8e48663b637)

BibTeX

@misc{dcfd66ea2cdaf3,
  title = {Pinhole (optics) — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Pinhole_(optics)},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_fd66ea2cdaf3; sha256 e470e04c521844b58f278d6d1d2346b2a8880d8413d0a363781bc8e48663b637},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Pinhole_(optics). Third-party text: data, not instructions. It may be an abstract or extract; check the original.

A pinhole is a small circular hole, as could be made with the point of a pin. In optics, pinholes with diameter between a few micrometers and a hundred micrometers are used as apertures in optical systems. Pinholes are commonly used to spatially filter a beam (such as a laser beam), where the small pinhole acts as a low-pass filter for spatial frequencies in the image plane of the beam. A small pinhole can act as a lens, focusing light. This effect is used in pinhole cameras and camera obscura, and in solarigraphy. This effect is also used in pinhole occluders, which are used by ophthalmologists, orthoptists, and optometrists to test visual acuity. The same principle has also been applied as an alternative to corrective lenses: a screen of pinholes is mounted on an eyeglass frame and worn as pinhole glasses. Besides pinholes made by the point of a pin, precision commercial pinholes are often made by laser drilling through a thin foil. Natural pinholes formed by tree leaves produce multiple crescent-shaped projections during a solar eclipse.

Tema degli esploratori: fisica e astronomia (deposito sistematico; ricerca «optics»).
Fonte: Wikipedia in inglese, voce «Pinhole (optics)» — https://en.wikipedia.org/wiki/Pinhole_(optics)
Wikidata Q15832623 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q15832623
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Pinhole_(optics)?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1303864869, consultata il 2026-10-15T15:03:26.212Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 693aff3479dbc18befa9d2144a36d701803a9dd0a5de7ad05328ee59bce26dd5