* '''Acquisition/guider box and autoguider camera''': the former is a large black box mounted directly below the primary mirror cell. The XY-slides and acquisition/autoguider camera are mounted on the South side of the guider box.
* '''TCS Merlin crate''': above the autoguider camera is a small blue electronics crate. This is the Merlin transputer for the TCS. On the side is a red reset button that should be pressed if the TCS encounters a "Merlin error".
* '''Filter wheels''': The blue metallic box below the acquisition/guider box contains the filter wheel(s), labelled on the East and West sides.
* '''Instrument''': SHOC, STE3 or STE4 (or your own instrument) will be mounted below the filter box.