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- Angénieux_retrofocus abstract "The Angénieux retrofocus photographic lens is a wide-angle lens design that uses an inverted telephoto configuration. The popularity of this lens design made the name retrofocus synonymous with this type of lens. The Angénieux retrofocus for still cameras was introduced in France in 1950 by Pierre Angénieux.The telephoto lens configuration combines positive and negative lens groups with the positive at the front, so as to reduce the back focal distance of the lens (the distance between the back of the lens and the image plane) to a figure shorter than the focal length. This is for practical, not for optical reasons, but rather because telephoto lenses can then be made shorter and less cumbersome.The inverted telephoto configuration does the reverse, employing one or more negative lens groups at the front to increase the back focal distance of the lens – possibly to a figure greater than the focal length – in order to allow for additional optical or mechanical parts to fit behind the lens.The inverted telephoto design was first employed in the 1930s by Taylor-Hobson for the early Technicolor "3-strip" cameras since the beam splitter unit behind the lens took up a significant amount of space, so that a long back focal distance was essential. Also, wide-angle lenses for narrow-gauge movie cameras had to be of this type because of the shutter mechanism that had to fit in between.In still photography, a single-lens reflex camera requires a space for the reflex mirror, imposing a limit on the use of wide-angle lenses of normal designs. The retrofocus lenses addressed this situation by shifting the focal plane further back than where it would normally be, thus making wider-angle lenses usable while retaining normal viewing and focusing. Unless the reflex mirror were locked in the "up" position, blacking out the viewfinder, the rearmost element of a non-retrofocal lens would be in the way as the mirror flipped up and down during exposure.Made in focal lengths of 24 mm, 28 mm, and 35 mm, the Angénieux retrofocus lens inspired all other lens makers to produce wide-angle lenses of this type for almost every 35mm SLR, and helped to make it the definitive camera type of the late 20th century.".
- Angénieux_retrofocus thumbnail Angenieux.png?width=300.
- Angénieux_retrofocus wikiPageExternalLink Retrofocus-Design-Problems-A-Synopsis-T37.html.
- Angénieux_retrofocus wikiPageExternalLink ageniuex.htm.
- Angénieux_retrofocus wikiPageID "196164".
- Angénieux_retrofocus wikiPageLength "3018".
- Angénieux_retrofocus wikiPageOutDegree "16".
- Angénieux_retrofocus wikiPageRevisionID "669888058".
- Angénieux_retrofocus wikiPageWikiLink 35_mm_film.
- Angénieux_retrofocus wikiPageWikiLink 35mm.
- Angénieux_retrofocus wikiPageWikiLink Back_focal_distance.
- Angénieux_retrofocus wikiPageWikiLink Beam_splitter.
- Angénieux_retrofocus wikiPageWikiLink Camera_lens.
- Angénieux_retrofocus wikiPageWikiLink Category:Photographic_lens_designs.
- Angénieux_retrofocus wikiPageWikiLink Focal_length.
- Angénieux_retrofocus wikiPageWikiLink France.
- Angénieux_retrofocus wikiPageWikiLink Image_plane.
- Angénieux_retrofocus wikiPageWikiLink Photographic_lens.
- Angénieux_retrofocus wikiPageWikiLink Pierre_Angénieux.
- Angénieux_retrofocus wikiPageWikiLink Single-lens_reflex_camera.
- Angénieux_retrofocus wikiPageWikiLink Taylor-Hobson.
- Angénieux_retrofocus wikiPageWikiLink Taylor_Hobson.
- Angénieux_retrofocus wikiPageWikiLink Technicolor.
- Angénieux_retrofocus wikiPageWikiLink Telephoto.
- Angénieux_retrofocus wikiPageWikiLink Telephoto_lens.
- Angénieux_retrofocus wikiPageWikiLink Wide-angle_lens.
- Angénieux_retrofocus wikiPageWikiLinkText "Angenieux".
- Angénieux_retrofocus wikiPageWikiLinkText "Angénieux retrofocus".
- Angénieux_retrofocus wikiPageWikiLinkText "Angénieux".
- Angénieux_retrofocus wikiPageWikiLinkText "retrofocus".
- Angénieux_retrofocus author Pierre_Angénieux.
- Angénieux_retrofocus elements "1".
- Angénieux_retrofocus hasPhotoCollection Angénieux_retrofocus.
- Angénieux_retrofocus scheme "Angenieux.png".
- Angénieux_retrofocus wikiPageUsesTemplate Template:Citation_needed.
- Angénieux_retrofocus wikiPageUsesTemplate Template:Cite_web.
- Angénieux_retrofocus wikiPageUsesTemplate Template:Infobox_lens_design.
- Angénieux_retrofocus wikiPageUsesTemplate Template:No_footnotes.
- Angénieux_retrofocus year "1950".
- Angénieux_retrofocus subject Category:Photographic_lens_designs.
- Angénieux_retrofocus comment "The Angénieux retrofocus photographic lens is a wide-angle lens design that uses an inverted telephoto configuration. The popularity of this lens design made the name retrofocus synonymous with this type of lens.".
- Angénieux_retrofocus label "Angénieux retrofocus".
- Angénieux_retrofocus sameAs Retrofokus.
- Angénieux_retrofocus sameAs Retrofokus.
- Angénieux_retrofocus sameAs لنز_رتروفوکال.
- Angénieux_retrofocus sameAs Retrofocus.
- Angénieux_retrofocus sameAs 逆望遠.
- Angénieux_retrofocus sameAs Retrofocus-_en_teleconstructie.
- Angénieux_retrofocus sameAs m.01bwfl.
- Angénieux_retrofocus sameAs Retrofokusobjektiv.
- Angénieux_retrofocus sameAs Q1935993.
- Angénieux_retrofocus sameAs Q1935993.
- Angénieux_retrofocus wasDerivedFrom Angénieux_retrofocus?oldid=669888058.
- Angénieux_retrofocus depiction Angenieux.png.
- Angénieux_retrofocus isPrimaryTopicOf Angénieux_retrofocus.