Adjective modifier

• classical: The classical Cassegrain In the classical Cassegrain telescope, the primary mirror is paraboloid shaped.

Modifies a noun

• telescope: Work on the cassegrain telescope feeds is in progress.

• focus: A secondary goal is for it to be useable at the direct f/16 Cassegrain focus when MCAO is either unavailable or inappropriate.

• rotator: It is NOT possible for the telescope to have the cassegrain rotator fixed and for you to simultaneously specify the field orientation.