Well, I've just done my first Exercise which involved looking through the camera with one eye and at a scene with the other. I found it incredibly difficult to know when I'd got it right - so that the scene through the viewfinder and with my naked eye were the same. In fact even now I don't know if I've got it right. And again, having printed off the photos knowing how far to hold the picture from my eye so that it was about the same size as the scene. It was helpful knowing that it needed to be a comfortable viewing distance and that did feel about right. So maybe I'm not so far wrong.

Shame the photos themselves were not very good. Still, they served a purpose. I'm going to try and attach the first one now.