The liquid nitrogen cooled heads contain a CCD mounted in a vacuum-sealed housing to minimise heat loss. It has been designed for applications where space is limited and it is available in a sideways as well as a downward looking configuration. Drawing is available here . The standard liquid nitrogen head has been ruggedised and adapted for more universal use than the compact unit. It has a number of mounting points built into the structure and can be configured to be used in upwards, downwards or sideways orientation.
Drawing is available here.
The performance of the camera heads varies with the type of cooled CCD system they are being used with. These differences are given in the tables below. Pentax K-mount or Nikon bayonet fittings. Side access for electrical connectors and for re-pumping. Electrical connector side access near front plate.