Assertion: lens's aperture | /r/HasProperty | full stop
Facets:
value: at 154mm
type: OTHER
value: faster
type: MANNER
Source sentences:
text: It has a fixed wide aperture that becomes faster than the 55-250 at 74mm and is a full stop faster at 154mm.
text: Lenses all have a maximum aperture (also called f/stop).
text: As you likely know, a lens tends to be at its sharpest when its aperture is slightly stopped-down.