Assertion: schmidt cassegrain telescope | /r/MadeOf | short tube
Facets:
value: with a concave spherical primary mirror
type: OTHER
Source sentences:
text: A Schmidt-Cassegrain telescope (SCT) in its usual configuration consists of a short tube with a concave spherical primary mirror, a full-aperture corrector lens, and a smaller convex secondary mirror located on the optical axis near the center of the corrector plate.