Assertion: eyepiece's design | /r/HasProperty | popular
Facets:
value: very
type: DEGREE
Source sentences:
text: While the Refractor and Newtonian designs are popular, there are a number of others available to the amateur astronomer.
text: Today it is a very popular design on the amateur astronomical market, where the name Plössl covers a range of eyepieces with at least four optical elements.