Assertion: eyepiece's eye relief | /r/CapableOf | range in the higher-end eyepieces
Facets:
value: from 90% of focal length
type: OTHER
Source sentences:
text: The eye relief is highly dependent on the specific eyepiece design, and can range from 10 to 90% of focal length, or, in the higher-end eyepieces, might be fixed at 12 or 20 mm.