Assertion: lens | /r/HasAspect | focal length
Facets:
Source sentences:
text: If the lens has a focal length range with two numbers (say 24-80 mm)
text: Some lenses, called zoom lenses, have a focal length that varies as internal elements are moved, typically by rotating the barrel or pressing a button which activates an electric motor.
text: Every lens in your kit will have a focal length listed on the lens.
text: So, instead of making a lens that has a focal length that is longer than the distance it is at, you make a lens that has a focal length that is shorter than the distance it is focused at.
text: So, instead of making a lens that has a focal length that is longer than the distance it is at, you make a lens that has a focal length that is shorter than the distance it is focused at.