Nope - this isn't a scene from an ER episode... Before departing for Cape Town, the gang donned their super-stylish clean room gear to help James & Janus install the gear for the M4/M5 wavefront test.
The tube is used to locate a pinhole (mounted on precision stages) just below the vertex of M5. The pinhole acts as a point source which the 2 mirrors then image & the resulting wavefront is measured by a Shack-Hartmann camera mounted at the focus.
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