Jostein, still your exposures were considerably longer (8s) than the
  time lag required for any mirror vibration to damp (2s). You may
  want to consider other factors, like lens collar rigidity in
  portrait orientation, wind, earthquakes... ;o)

  Servus,  Alin

Jostein wrote:

JO> Especially with exposure times around 1 second and Portrait orientation. I
JO> have some specific comments about Z-1 and FA*400/5.6 on my web site:
JO> http://home.c2i.net/jostein.oksne/Utstyr/fa400/fa400-test.htm


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