File:Olhos de um gato.jpg
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DescriptionOlhos de um gato.jpg |
"Unlike human eyes, which work best in day light, the cat’s eyes must function well in extremely low light condition and as such are well suited to an animal that is predominantly nocturnal and crepuscular in activity. In darkness, cats eyes are able to function in approximately one-sixth of the light needed for human vision. However they must also be able to function well in daylight – so just how is this achieved. In low light levels the cats pupil must be able to open as wide as possible, but also be able to contract to very small size to protect the sensitive retina in bright sunlight. In human eyes, this size variation of the pupil is controlled by a circular ciliary muscle, but this limits the amount of size variation. In cats however, the same process is controlled by two, shutter-like ciliary muscles, which gives the cat it’s characteristic slit-like pupil in bright light conditions. " |
Date | |
Source | Cat Eyes (#30793) |
Author | Mark J Sebastian |
Other versions |
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This image was originally posted to Flickr by mark sebastian at https://www.flickr.com/photos/71865026@N00/1394560975. It was reviewed on 24 August 2009 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-sa-2.0. |
24 August 2009
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current | 06:55, 24 August 2009 | 2,676 × 1,792 (1.99 MB) | Tm (talk | contribs) | {{Information |Description="Unlike human eyes, which work best in day light, the cat’s eyes must function well in extremely low light condition and as such are well suited to an animal that is predominantly nocturnal and crepuscular in activity. In |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 5D |
Exposure time | 1/500 sec (0.002) |
F-number | f/1.2 |
ISO speed rating | 100 |
Date and time of data generation | 16:52, 16 September 2007 |
Lens focal length | 50 mm |
Width | 2,676 px |
Height | 1,792 px |
Compression scheme | Uncompressed |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 150 dpi |
Vertical resolution | 150 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop CS3 Macintosh |
File change date and time | 22:38, 16 September 2007 |
Exposure Program | Aperture priority |
Exif version | 2.21 |
Date and time of digitizing | 16:52, 16 September 2007 |
APEX shutter speed | 9 |
APEX aperture | 0.625 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 3,086.9259259259 |
Focal plane Y resolution | 3,091.2954545455 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |