Assertion: eyepiece | /r/HasProperty | one of the more expensive
Facets:
value: because of the quality of glass
type: CAUSE
Source sentences:
text: This eyepiece is one of the more expensive to manufacture because of the quality of glass, and the need for well matched convex and concave lenses to prevent internal reflections.
text: This eyepiece is one of the more expensive to manufacture because of the quality of glass, … Monocentric eyepiece diagram.