Assertion: telescope's tube | /r/HasProperty | short
Facets:
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.
text: The optical tube is short, about 24 inch, which makes it easy to carry everywhere and the focal ratio is quite fast, about f/5.