Canon EF 50mm f/1.8 STM Lens Review
This lens is an update to the popular and inexpensive standard 50mm f/1.8 EF lens , replacing the standard focusing motor with Canon's new stepping motor technology, which promises smoother, quieter autofocus performance, which is especially suited to recording video.
Very good sharpness in the centre at maximum aperture; Excellent sharpness when stopped down; Lightweight; Silent focusing; Good build quality
Sluggish focus speeds; Sharpness could be better towards the edges at fast apertures