This is the third and hopefully the last film on the differences between the OM-1 Mk1 and Mk2. A watcher of my You tube channel pointed out a flaw with the OM-1 Mk1 that I was not aware of, but has almost certainly lost me pictures in the past. When you zoom with the 150-400mm the camera will not take pictures, but it is not obvious this is happening. I zoom a lot and have sometimes wondered why I am some pictures missing. The Mk2 does not have this issue. Mike Lane wildlife photography https://www.nature-photography.co.uk/