YES! these frame is one take we made with that 25x250mm, the "vignetting" is in the negative, and I'm shure, we don't have mateboxes or another kind of external problems..., I try contact Angenieux, but they don't answer me, yet. The great mistery is we are using from 105mm to 250mm, I suspect something in the diaphragm system but I don't have knownleadge about, Thank you one more time, regards, Leone.