Assertion: mm eyepiece | /r/HasProperty | redundant
Facets:
value: largely
type: DEGREE
Source sentences:
text: If you are contemplating purchasing a Barlow with a set of eyepieces, give some thought to staggering the focal lengths so that they are not simple multiples of one another: a 10 mm eyepiece is largely redundant if you use a 20 mm and a Barlow.