Assertion: series eyepiece | /r/HasAspect | apparent fields of view of 45°
Facets:
value: to 60°
type: OTHER
Source sentences:
text: The standard Lanthanum series eyepieces retain the 20mm eye relief of the premium line, but have apparent fields of view of 45° to 60°, rather than the 65° to 72° of the premium series.