So I bought a PL14-150 f/2.8-3.5 and have some questions about how to use it. Aperture ring - it appears you can set it manually via either the ring or the camera. If you want to control it from the camera, the ring needs to be set to A, and if you want to set it manually on the lens, the camera must be in A mode to read the aperture. Is that correct? Focus - are all 43 lenses focus by wire? Is it true that everything beyond 3' or so will be infinity focus?