|  | 5x1 LED illuminator for the "Tollestrup Telescope". This unit was to have put a column of 5 LED spots on the detector for a particular camera positioning. It didn't actually work that way in practice. | 
          
            |  | Baffles and anti-reflection rifle tubes for F/17 camera and other units. | 
          
            |  | Camera Block | 
          
            |  | Collimator stack, after anodizing | 
          
            |  | filter wheel position encoder magnet stack | 
          
            |  | LiF crystal test piece after cold testing. Note scratch ring on underside from G10 support system. | 
          
            |  | Slit belt cog wheel | 
          
            |  | Slit belt unit, partially assembled | 
          
            |  | Test crystal after cold testing, Note scratch mark all around back face. We believe the compressor's vibrations must have stimulated the crystal to precess and so become scratched. | 
          
            |  | Test crystal pieces after cold tests. | 
          
            |  | Another view | 
          
            |  | Zoom of ZnSe test piece with Silicon diode thermal sensor |