File:Lentille de Fresnel (Musée national de la Marine) (15879053936).jpg
Original file (1,200 × 1,200 pixels, file size: 1.38 MB, MIME type: image/jpeg)
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Summary
DescriptionLentille de Fresnel (Musée national de la Marine) (15879053936).jpg |
Système optique (détail) du phare d'Hourtin en Gironde qui a été en service jusqu'à la décennie 1950 La lentille de Fresnel est une lentille à échelons, composée d'une lentille centrale plan convexe et d'anneaux dioptriques superposés à cet élément et ayant leurs faces intérieures planes. L'ensemble fonctionne comme une lentille de projection de très grandes dimensions, c'est pourquoi ce type de lentille est utilisé pour les phares. Elle transforme les rayons lumineux émis par une source placée en son foyer en faisceau parallèle. (Construction, réglage et essais des instruments d'optique, par M. Lachenaud, Editeur Béranger/Dunod, 1966, Paris)
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Date | |
Source | Lentille de Fresnel (Musée national de la Marine) |
Author | Jean-Pierre Dalbéra from Paris, France |
Camera location | 48° 51′ 42.47″ N, 2° 17′ 13.96″ E | View this and other nearby images on: OpenStreetMap | 48.861798; 2.287211 |
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Licensing
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This image was originally posted to Flickr by dalbera at https://www.flickr.com/photos/72746018@N00/15879053936. It was reviewed on 9 December 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
9 December 2014
Items portrayed in this file
depicts
some value
28 November 2014
48°51'42.473"N, 2°17'13.960"E
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:04, 9 December 2014 | 1,200 × 1,200 (1.38 MB) | Medium69 | Transferred from Flickr via Flickr2Commons |
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Metadata
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If the file has been modified from its original state, some details may not fully reflect the modified file.
Camera manufacturer | SONY |
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Camera model | ILCE-7 |
Exposure time | 1/160 sec (0.00625) |
F Number | f/4 |
ISO speed rating | 5,000 |
Date and time of data generation | 15:15, 28 November 2014 |
Lens focal length | 37 mm |
Width | 6,000 px |
Height | 4,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 350 dpi |
Vertical resolution | 350 dpi |
Software used | Adobe Photoshop Elements 12.0 Macintosh |
File change date and time | 13:49, 29 November 2014 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 15:15, 28 November 2014 |
Meaning of each component |
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Image compression mode | 5 |
APEX shutter speed | 7.321928 |
APEX aperture | 4 |
APEX brightness | 0.5640625 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 37 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Lens used | FE 28-70mm F3.5-5.6 OSS |
Date metadata was last modified | 14:49, 29 November 2014 |
Unique ID of original document | E60F74C7E58472118E290BAF81A390FC |