Large-format slide projector: Difference between revisions

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[[File:Ravensburg Konzerthaus PANI-Projektor 01.jpg|thumb|PANI-Projektor, a large-format slide projector in the [[Ravensburg]] [[concert hall]]]]

A '''large-format slide projector''' (also often called '''large-format projector''' or '''large-image projector''') is a kind of [[slide projector]] for large image projection which has a very powerful [[light source]] (up to 12 thousand watts using [[arc lamps]]). ThereforeThe itlight is necessary tosource usegenerates a largelot slideof formatheat toeven protectwhen the slidefiltered materialto fromonly overheatingvisible duringlight; the projectionprojected process (even when the lighttransparency is filteredprotected tofrom onlyoverheating visibleby lightthe andheat thebeing slidedistributed isacross cooledits withlarge strongarea, slideand cooling fans). Slide formats include 18 × 18 cm (7.1 × 7.1") or 24 × 24 cm (9.4 × 9.4").

==Projection art==

These formats are so large that it is possible to project slides painted with heat resistant translucent colours as a special kind of art (projection art). The light output of the projector is solarge enormousenough thatto itproject is possible to coveronto whole buildings with an artistic cover of light.

==History==

The first large-format slide projectors were built in the middle of the 20th century as background projectors for theaters and opera houses. From the early 50', the german Brand Reiche&Vogel was offering in a catalog a 2000w slide projector using 4.75"x 4.75" (12x12cm) slide or a scroller for film strip of the same size. They will produce a 5000w model no long after this first. The artists Professor[[Günther Schneider-SiemmsenSiemssen]],<ref>{{cite web|url=http://www.fanfaire.com/schneider-siemssen/index.html|archive-url=https://web.archive.org/web/20120210022744/http://www.fanfaire.com/schneider-siemssen/index.html|date=c. 2008<!--copyright date-->|archive-date=10 February 2012|title=The Cosmic Space of Gunther Schneider-Siemssen, stage set designer |url-status=usurped|publisher=Fanfaire.com }} {{Failed verification|date=April |accessdate=2013-03-122024}}</ref> and Professor Svoboda and [[Herbert von Karajan]] used the large format slide projectors as stage projectors in their artwork. In good cooperation with the technician Ing. Ludwig Pani,<ref>[http://aarental.com/pani-producing-state-of-the-art-stage they improved large-format slide projectors- for-nearly-a-century/ ]</ref>stage, theyand realized the first large format projections as an integrated part of their artwork.

==Manufacturers==

Large scale image projectors have been pioneered by manufacturers Reiche&Vogel, Pani, Hardware Xenon and PIGI. These projectors are usually described as scenic projectors, and project light through photographic or inkjet media, unlike video projectors that reflect light off of LCD or DMD (digital micro mirror, sometimes referred to as DLP) devices. Despite advancements in video technology, still image projectors are still capable of many times the luminous output of video projection devices. Scenic projectors sometimes utilize roll based projection media, which allows quick access to hundreds of images and the creation of scrolling imagery, as well as rotating imagery.

The most powerful image projectors in the world are built by the company XL Productions. These one of a kind image projectors utilize large format lenses designed for Cold War surveillance systems, such as the U2 spy plane, and use other advanced optical systems and techniques to achieve image sizes and brightness levels far beyond that which is capable with commercially available projectors. XL Productions has presented imagery for events like the Olympics, the Super Bowl and other special productions. In 2000, XL Productions achieved projected image sizes as much as one mile across on [[Sugarloaf Mountain (Brazil)|Sugarloaf Mountain]] in Rio de Janeiro, Brazil.

==See also==