I had a similar this discussion with Hasselblad's optical engineer. For reference his initials were E. P. It is not appropriate to supply his name. He was responsible for the glass and mechanical lens parts. He recommended low humidity to avoid growth <35%. The shutter should be stored uncocked since this puts less stress on the main spring. If removed from the camera use a coin to slow down the unwinding of the shutter mechanism. (Hold a coin in the slot then trip the lens by pushing the protected release on the back of the lens.) Store at 1 second since this is also a less stressed position.
To keep the shutter parts lubricated, activate the lens at least once a year at a variety of speeds. Also, rotate the focusing ring through the range. Storing at a variety of orientations keeps the lubricate from building up in one place.
To reinstall on the camera body, carefully wind the lens with the coin. Be careful not to let the coin slip.
The camera leaves the lens cocked in order to provide a user feature. The lenses can standup to this use but it may not be ideal for long term storage.
It is still best to use it!
Last edited by laser; 01-01-2012 at 08:48 PM. Click to view previous post history.