Hasselblad offers a choice of four extension tubes in lengths of 8, 16, 32 and 56mm. These tubes allow you to work inside the minimum focusing distance of your lens and are especially useful for any kind of macro work.
Note:
Extension Tube 8 CANNOT be connected to a 200 or 2000 Series camera body. In addition, it does not have a databus connection
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