Assertion: tripod's ball head | /r/HasAspect | one control
Facets:
value: compared to pan-tilt heads
type: OTHER
Source sentences:
text: compared to pan-tilt heads, ball-heads only have one control that loosens or tightens the grip.
text: In contrast, a ball head only has one control that loosens or tightens the grip, allowing flexibility and smooth operation.