Assertion: focal ratio | /r/HasProperty | corrected for lens extensions
Facets:
value: by a bellows factor
type: OTHER
Source sentences:
text: The working f-number is often described in photography as the f-number corrected for lens extensions by a bellows factor.
text: In photography, the working f-number is described as the f-number corrected for lens extensions by a bellows factor.
text: The working f-number is often described in photography as the f-number corrected for lens extensions by a bellows factor.