Quote Originally Posted by HocusPocus View Post
John Koehrer,
Mamiya 645 Pro - Curitan - From Left to Right
That did not seem correct to me but I am not familiar with the Pro models so I did some looking around.
I found an online post somewhere else that indicates Mamiya changed the shutter on the 645 series with the Super and Pro models so now it runs horizontally.
So, with that being the case your problem is almost certainly due to the shutter curtains timings being out of adjustment. A decent camera repairman should be able to fix that for you.