Assertion: eyepiece's length | /r/HasProperty | 18mm
Facets:
value: maybe
type: DEGREE
Source sentences:
text: Then you might try a slightly higher-power (shorter focal length, maybe 18mm or 15mm) eyepiece and see if the view looks any better.
text: Then you might try a slightly higher-power (shorter focal length, maybe 18mm or 15mm) eyepiece and see if the image looks any better.