Assertion: lens's aperture | /r/HasProperty | lens
Facets:
Source sentences:
text: When you look at the name of a zoom lens, if there is only a single aperture given, this is a constant aperture zoom lens.
text: If there are two F-stops named with a dash in between, this is a variable aperture zoom lens.
text: —there doesn’t need to be any adjustments as you zoom to recompose with a constant aperture zoom lens.
text: What the above chart also shows is that this is a relatively slow (narrow aperture) lens.