Originally posted by stevebrot Vertical travel cloth shutter on the 645N. Normally sticky shutter has a bit of a stutter to it, though I suspect it is the cause of your pain. If the camera is a recent purchase, you may have reason to contact the seller. In any case, this is probably easily fixable with a CLA.
Steve
Not a recent purchase - my wife bought me this body for Chrismas 2010 from KEH.
I emailed Eric to make sure he handles the 645N. He does although he doesn't stock parts for the 645N and (if needed) they can take up to a month to get from Pentax.
That said, he's done a K1000 SE and a Spotmatic CLA for me before and I've got nothing but praise for his work.
Off to Eric this beast goes!
Thanks for everyone's help on this 'whodunit'.
R