I have an old Novoflex slide focus type lens. It had no objective lens when I got it so I made a lens cell with 80mm diameter 750(?) lens. A vistant object focuses good in the view finder of my K-5 but the picture is very poor. I know about vibration etc but I wonder what settings I should have on the camera? The top knob is set to Av, focus is MF, what else can I set? Thanks, John