Hi
Our studio recently purchased a couple of 645 DF plus bodies with IQ280 backs,the lenses are either Phase One 120 macros or 80mm Schneiders and we are running these with Capture One 7 (some of our computers are unable to run Mavericks/Yosemite) .
We are getting a reccurring problem which is- for no reason whatsoever (during tethered shooting) the lens will reset to its maximum aperture ,this usually doesn't cause too much of an issue as it is very apparent on screen and you just re-stop down the lens ,but on occasion will happen at the very worst moment and recently cost me very dearly during a shot with liquid moving where my perfect shot was totally overexposed
Sometimes with one of the cameras/backs the aperture will also move a third of a stop or so- we put this down to probable user error, but have recently realised that its been happening to several Photographers using that particular camera /lens combo.
Apart from this we love the cameras ,but before I start getting involved with our dealer I thought I would put this out there and see if anyone else is having similar issues or knows what is causing it?
Thanks in advance
Andy