Hi,
Just thinking loud which means that the word Macro says it all.
I just looked on the focusing ring of my Canon 180mm f3.5 and saw that the focusing ring is quite open when I focus in the near range eg. the numbers do take up a lot whole of the scale in the near focusing range and less in the far focusing range.
What I want to say is that it will be difficult to focus a Macro lens in the infinity region but it is easy to focus in the near range ...
Think about that
regards Rainer