My Jin Pen F -> m43 adapter arrived today from China. Fits well onto the E-P1, but I'm not sure I've got the lens side (Pen F 38mm/F1.

right.
a) I can only squeeze-screw the lens on so that it kind of sticks, but it doesn't really lock - shouldn't it?
b) there is no movement of the "aperture lever" (not sure what the proper term is) inside the lens, so that changing the aperture setting on the lens doesn't effect anything.
I mean, I can take great portraits at F1.8 (which is why I got the lens in the first place), but I think there's something wrong either with the way I try to connect the adapter or with the adapter itself..
Anyone with experience with this adapter? Any help appreciated