Assertion: focal ratio's difference | /r/HasProperty | few conventional
Facets:
Source sentences:
text: while shutter speeds in reciprocal seconds have a few conventional differences in their numbers (​1⁄ 15 , ​1⁄ 30 , and ​1⁄ 60 second instead of ​1⁄ 16 , ​1⁄ 32 , and ​1⁄ 64 ).
text: while shutter speeds in reciprocal seconds have a few conventional differences in their numbers (1/15, 1/30, and 1/60 second instead of 1/16, 1/32, and 1/64).
text: while shutter speeds in reciprocal seconds have a few conventional differences in their numbers (​1⁄ 15 , ​1⁄ 30 , and ​1⁄ 60 second instead of ​1⁄ 16 , ​1⁄ 32 , and ​1⁄ 64 ).