Assertion: telescope's design | /r/HasAspect | primary mirror
Facets:
value: with a focal ratio of f/2
type: OTHER
value: with a secondary
type: OTHER
Source sentences:
text: Most compact designs from Meade and Celestron have a primary mirror with a focal ratio of f/2 and a secondary with a focal ratio of f/5 yielding a system focal ratio of f/10.