File:25. Boon Island Light Lens (3533875099).jpg
![File:25. Boon Island Light Lens (3533875099).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/23/25._Boon_Island_Light_Lens_%283533875099%29.jpg/657px-25._Boon_Island_Light_Lens_%283533875099%29.jpg?20201104023214)
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Summary
[edit]Description25. Boon Island Light Lens (3533875099).jpg |
Kittery Historical and Naval Museum. Second order Fresnel Lens. In 1822 a French Physicist named Augustin Fresnel invented a lens that would make his name commonplace along the seacoasts of Europe and North America. It looked like a giant glass beehive, with a light at the center. The lens could be as tall as twelve feet, with concentric rings of glass prisms above and below to bend the light into a narrow beam. At the center the lens was shaped like a magnifying glass, so the concentrated beam was even more powerful. Tests showed that while an open flame lost nearly 97% of its light, and a flame with reflectors behind it still lost 83% of its light, the fresnel lens was able to capture all but 17% of its light. Because of its amazing efficiency, a fresnel lens could easily throw its light 20 or more miles to the horizon. <a href="http://lighthousegetaway.com/lights/fresnel.html" rel="noreferrer nofollow">lighthousegetaway.com/lights/fresnel.html</a> |
Date | |
Source | 25. Boon Island Light Lens |
Author | InAweofGod'sCreation |
Camera location | 43° 06′ 03.7″ N, 70° 44′ 31.34″ W ![]() | View this and other nearby images on: OpenStreetMap | ![]() |
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Licensing
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This image was originally posted to Flickr by InAweofGod'sCreation at https://flickr.com/photos/36783643@N05/3533875099. It was reviewed on 4 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 November 2020
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current | 02:32, 4 November 2020 | ![]() | 1,352 × 1,234 (293 KB) | JotaCartas (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | EASTMAN KODAK COMPANY |
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Camera model | KODAK CX7430 ZOOM DIGITAL CAMERA |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/2.7 |
Date and time of data generation | 11:20, 21 August 2004 |
Lens focal length | 5.6 mm |
Horizontal resolution | 230 dpi |
Vertical resolution | 230 dpi |
Software used | picnik.com |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 11:20, 21 August 2004 |
Meaning of each component |
|
APEX shutter speed | 6 |
APEX aperture | 2.8659188034188 |
APEX exposure bias | 0 |
Maximum land aperture | 2.8659188034188 APEX (f/2.7) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Exposure index | 80 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |