I recently bought a Mamiya C220 with said lens. All speeds are about 2/3 to 1 stop too slow. The faster ones are in better shape, but my measurement method gets really inaccurate after 1/125. Now, I've already serviced the camera - cleaned and relubed the internals, adjusted the focus, and would like to service the shutter myself. Can anyone point me to a service manual or some other resource that details the workings of the shutter mechanism? Ideally I'd need disassembly/assembly instructions and adjustment procedure. I hope it all comes down to cleaning and lubrication(?). I'd really like to avoid going in blind. The lens is the black version and has a pale blue dot. For now I can use it as is. I measured the speeds by recording the shutter sound with Audacity and used a lookup table while shooting some slides. The results are largely great, so I reckon this way of measuring shutter speed is good enough.
Thanks.
Thanks.