I have the A570, and was surprised to read this recommendation to use macro mode focusing. I never do this, so tried it. I attach the following two photos taken with my A570. The first photo shows the results obtained using autofocus. The second photo is done in macro mode.
Clearly, the macro setting did not work for this setup. Sometimes I find it useful to use Manual focus, as autofocus does not always lock on.
It's not likely that Macro will work at full zoom. I find generally that it works well from wide to half zoom (on my 8400 it's wide to 35 % zoom ) and then I would switch it off. Even below half zoom you often would have to re-focus the scope after switching on Macro. If you watch the screen closely you will see the screen go out of focus when you switch it on. Also at full zoom there may not be enough contrast (low light levels) for AF to be reliable. I often use Manual focus over 2/3rds zoom and always at full zoom.
Neil.