Apple Final Cut Pro 5 - Manual (Page 917)

130 Part I Media and Project Management
3 Zoom in to the clip as far as possible.
4 Hold down the Shift key as you drag the playhead to the exact place where the
click occurs.
5 Click the Level Keyframe button to mark four keyframes in a row.
When you’ve zoomed
in all the way, the
playhead in the Viewer
is the width of one
video frame.