Assertion: eyepiece | /r/HasAspect | a field of view of 50-60°
Facets:
value: typically
type: TEMPORAL
Source sentences:
text: Typically, an eyepiece has a field of view of 50-60°, although there are wide-field eyepieces that go up to as much as 82° (and higher -- I just saw one that has a field of 100°!).