Assertion: newtonian telescope's mirror | /r/CapableOf | allow switching
Facets:
value: between a newtonian configuration
type: OTHER
Source sentences:
text: Maksutov - Cassegrains have interchangeable secondary mirrors that allow switching between a Newtonian configuration where the image comes out of the side of the tube or a Cassegrain configuration where the image comes out of the back of the tube through a hole in the primary mirror.