Assertion: reflecting telescope's mirror | /r/CapableOf | get unlike refractor's mounted lens
Facets:
value: out of alignment
type: OTHER
value: solidly
type: MANNER
Source sentences:
text: Unlike a refractor's solidly mounted lens, a reflector's mirrors can get out of alignment and hence will need periodic collimation (adjustment) to ensure peak performance, particularly if the telescope is moved frequently.