Assertion: eyepiece's field | /r/HasProperty | tied to it's type
Facets:
value: closely
type: DEGREE
Source sentences:
text: The apparent field of an eyepiece is closely tied to it's type, or lens configuration, and you will find apparent fields are available in only certain ranges, typically 52°-55°, 68°, 82° and just recently (2009) 100°.