Definitions of various terms related to photographs and photography equipment.
LensRange)A range of focal lengths for a specific lens, with a constant maximum aperture value.
<rdf:Description rdf:about="http://www.wasab.dk/morten/2003/07/ef28-105#lens">
<photo:range>
<photo:LensRange>
<exif:maxApertureValue>284416/65536</exif:maxApertureValue>
<photo:minFocalLength>85</photo:minFocalLength>
<photo:maxFocalLength>105</photo:maxFocalLength>
</photo:LensRange>
</photo:range>
<photo:range>
<photo:LensRange>
<photo:maxFocalLength>83</photo:maxFocalLength>
<photo:minFocalLength>35</photo:minFocalLength>
<exif:maxApertureValue>262144/65536</exif:maxApertureValue>
</photo:LensRange>
</photo:range>
<photo:range>
<photo:LensRange>
<exif:maxApertureValue>236894/65536</exif:maxApertureValue>
<photo:minFocalLength>28</photo:minFocalLength>
<photo:maxFocalLength>30</photo:maxFocalLength>
</photo:LensRange>
</photo:range>
</rdf:Description>
flashBiasValue)The flash exposure bias, usually a decimal number in the range -99.99 to 99.99.
fovCropFactor)The field-of-view crop factor for a digital camera, a decimal number equal to or larger than 1.0.
maxFocalLength)The maximum focal length of a lens range, expressed in milimeters.
minFocalLength)The minimum focal length of a lens range, expressed in milimeters.
owner)The owner of a piece of photography equipment, equivalent to the EXIF property "exif:owner", but with a range of "foaf:Person". Note that this is not a functional property.
serial)The serial number for a piece of photography equipment.
serial_sha1sum)The SHA1sum of serial number for a piece of photography equipment, expressed as 40 lowercase hexadecimal digits.
similarity_hash)A similarity "hash", consisting of 37 lowercase hexadecimal digits (1 digit for general brightness, 9 digits for regional brightness, and 27 digits for regional colours).
<foaf:Image rdf:about="http://www.wasab.dk/morten/2005/04/photos/2/t/image-2.jpg"> <photo:similarity_hash>5555455555f60f60f60f50f30f40f60f40f60</photo:similarity_hash> </foaf:Image>