Assertion: focal ratio | /r/CapableOf | use external light meters
Facets:
value: particularly
type: MANNER
Source sentences:
text: T-stops are sometimes used instead of f-numbers to more accurately determine exposure, particularly when using external light meters.
text: Lens transmittances of 60%â"90% are typical, so T-stops are sometimes used instead of f-numbers to more accurately determine exposure, particularly when using external light meters.
text: T-stops are sometimes used instead of f-numbers to more accurately determine exposure, particularly when using external light meters.