Some insights please:
Was just testing my Mamiya 645 DF (with DM22) with the Mamiya 80mm LS D, particularly flash sync. Ran thru the motions, from 1/125 and peaked at 1/1600. After a few shots, the lens suddenly acts up and does not close back up immediately. Now the shots all look like they were half a second long, with ambient light coming in. Was using both PW Plus II's and Sync Cords (alternately). I checked and played with the Custom Settings, no joy. Tested the 80LS as FS lens only, and it works ok up until 1/125, it's max sync speed, didn't push any further.
Does it sound like my lens just got busted? It's brand new, along with everything else...