The extension tubes can be used in combination with each other, with the Proxar close-up lenses, or with the Automatic Bellows Extension

Extension Tubes 16E, 32E, and 56E are equipped with electronic databus couplings which transfer information from the lenses to the micro-processors in the 200 Series camera bodies

The "E" extension tubes are also compatible with all other Hasselblad SLR camera models and the FlexBody