USM Focus
USM (UltraSonic Motor) is a lens sharpening system characterized by Canon. This drive uses piezoelectric micromotor to autofocus on subjects.
Benefits of USM sharpening
- Very high speed
- Softness
- Precision
USM (UltraSonic Motor) is a lens sharpening system characterized by Canon. This drive uses piezoelectric micromotor to autofocus on subjects.