Synonyms for Telescopic (same or very similar meaning)
WordNet sense 1 (capable of being seen; or open to easy view):
visible, seeableWordNet sense 2 (able to see distant objects clearly):
farsighted, presbyopicWordNet sense 3 (capable of collapsing or being collapsed):
collapsible, collapsableFrom the ODE community, based on WordNetadd/edit