Assertion: focal ratio | /r/HasProperty | the same
Facets:
Source sentences:
text: Second, the image scale of the 200″ telescope is much greater even though the speed is the same.
text: First, note that this means with a given pixel size, even though the 200″ gathers 625x more light than the 8″, it also spreads it out over 625x the area, so both are the same “speed” because the focal ratio is the same.