Canon EOS 30D Instruction Manual page 273

Useful at times like these!
Macro photography can only focus
on a small area. The impression
of a photograph changes
dramatical~
by making a small shift in the focusing
point. Use autofocus for quick focus,
and then turn the focus ring. When
you keep your attention on the
viewfinder and fine-tune the focus,
the difference in the finished photo
will be immediately apparent.
I 29 I
What is full-time manual focus?
Use this function to make precise adjustments after focusing quickly on autofocus without switching to manual.
This brings out the full potential
of
the photographer's expressive abilities.