PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Optically, you are right, however, if you put e.g. a 18-105 DX lens on a D700, most of the picture will show serious (completely black) vignetting, so you will have to crop the picture to arrive at a non-vignetted image, so the effective angle of view is reduced, so the effective focal length is increased.
http://www.w3.org/ns/prov#wasQuotedFrom
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