File:Fresnel lens (36901834486).jpg
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Summary
[edit]DescriptionFresnel lens (36901834486).jpg |
Fresnel lens A fourth order Fresnel lens, the second light used at Whitefish Point Lighthouse. The original structure was outfitted with Lewis lamps. A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances. In 1968, the light was replaced with a DCB-224 aero beacon, visible for a distance of 26 nautical miles, 30 miles. The DCB-224 Series Carlisle & Finch aerobeacon lens was changed to a light-emitting diode (LED) lantern with a reduced range of 15 nautical miles, 17 miles as permitted by Coast Guard. The aerobeacon lens is stored in a building on the Great Lakes Shipwreck Museum complex for possible future public display. (Wikipedia) |
Date | |
Source | Fresnel lens |
Author | Deb Nystrom from Ann Arbor, Michigan, USA |
Licensing
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This image was originally posted to Flickr by Tatiana12 at https://flickr.com/photos/98826299@N00/36901834486. It was reviewed on 30 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
30 November 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:45, 30 November 2020 | ![]() | 3,192 × 4,526 (4.4 MB) | 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 | NIKON CORPORATION |
---|---|
Camera model | NIKON D3300 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/3.5 |
ISO speed rating | 5,600 |
Date and time of data generation | 13:16, 2 September 2017 |
Lens focal length | 18 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Photos 2.0 |
File change date and time | 13:16, 2 September 2017 |
Exposure Program | Not defined |
Exif version | 2.3 |
Date and time of digitizing | 13:16, 2 September 2017 |
Meaning of each component |
|
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.6 APEX (f/3.48) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 40 |
DateTimeOriginal subseconds | 40 |
DateTimeDigitized subseconds | 40 |
Supported Flashpix version | 1 |
Sensing method | One-chip color area sensor |
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 | 27 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Lens used | AF-S DX VR Nikkor 18-55mm f/3.5-5.6G II |
Serial number of camera | 3289949 |
Rating (out of 5) | 0 |