Full-time Manual Focus
Manual focus (MF) is frequently preferred for macro photography and other shooting scenarios requiring precise focusing. However, most photographers prefer to use autofocus (AF) to quickly bring the subject into focus. In such cases, the full-time manual focus (AF + MF) setting is the appropriate option. After using One-shot AF to obtain an approximate focus, the user can make the final focal adjustment manually by rotating the lens's focus ring while still in AF mode. Full-time manual focus is extremely useful in macro photography for focusing on a specific detail, such as one part of a flower. After a rough autofocus adjustment, the user can make adjustments to bring the desired target into focus. This feature was first introduced in the early EF lens series and is now available on many RF lenses.