C. & E. Voelker wrote in message ...

>My Nikkor 55 mm Micro lens wont close down after not being used for some
>time. Any suggestions will be much appreciated. Thanks for any
>information. E. Voelker

An unfortunate common problem with the 55mm f2.8 MF Micro-Nikkor is
the tendency of lubricants to migrate to the diaphragm leaves,
slowing or sticking them together (whether or not the lens is used).
A cleaning is probably in order.
Hope This Helps
David Ruether - http://www.fcinet.com/ruether