I got Vivitar 28-210mm 3.5-5.6 lens with Pentax PK mount. Connected to GH2 with adapter, the lens has an issue: it doesn't allow focus for less than 5 meters. So I modified the adapter adding thin ring lamella between the black part of the adapter and its metal mount ring, so that to increase the distance a little between the lens and GH2. The result is a perfect focus from 1 meter and longer. BUT: no infinity focus anymore! The focus for long distance objects is possible only when the lens is zoomed at 40-50mm at least. Then I tried the modification with thinner lamella, but the close up focus is not possible, also zooming in up to 70mm doesn't give focus too. It's like there is not enough turning space of the lens to left or right so that every distances can be in focus. Is this issue solvable somehow?